How 'A Star Is Born' contributed to Bradley Cooper and Irina Shayk's split

Turns out, "A Star Is Born" did have a negative effect on Bradley Cooper's relationship with longtime girlfriend, Irina Shayk.

People reports that the intense filming process -- during which Cooper served as both director and star -- put too much space between the couple, and they ultimately weren't able to repair the damage.

"Bradley was emotionally absent during the long time filming 'A Star Is Born,'" a source explained. "They tried to save the relationship, but it had changed."

SEE ALSO: Bradley Cooper and Irina Shayk's relationship was 'hanging on by a thread'

Insiders revealed that "they couldn't break up when he was doing promotion for 'A Star Is Born'" because of the spotlight being shown on their relationship during that time.

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Irina Shayk and Bradley Cooper together
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Irina Shayk and Bradley Cooper together
HOLLYWOOD, CALIFORNIA - FEBRUARY 24: Bradley Cooper and Irina Shayk arrives at the 91st Annual Academy Awards at Hollywood and Highland on February 24, 2019 in Hollywood, California. (Photo by Steve Granitz/WireImage)
HOLLYWOOD, CALIFORNIA - FEBRUARY 24: (L-R) Gloria Campano, Bradley Cooper and Irina Shayk attends the 91st Annual Academy Awards at Hollywood and Highland on February 24, 2019 in Hollywood, California. (Photo by Frazer Harrison/Getty Images)
HOLLYWOOD, CALIFORNIA - FEBRUARY 24: (L-R) Bradley Cooper and Irina Shayk attend the 91st Annual Academy Awards at Hollywood and Highland on February 24, 2019 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
NEW YORK, NY - FEBRUARY 07: Bradley Cooper and Irina Shayk arrive at JFK airport on February 7, 2019 in New York City. (Photo by ECP/GC Images)
NEW YORK, NY - JANUARY 08: Bradley Cooper and Irina Shayk attend The National Board of Review Annual Awards Gala at Cipriani 42nd Street on January 8, 2019 in New York City. (Photo by Jamie McCarthy/Getty Images for National Board of Review)
BEVERLY HILLS, CA - JANUARY 06: Irina Shayk, Bradley Cooper arrives at the 76th Annual Golden Globe Awardsat The Beverly Hilton Hotel on January 6, 2019 in Beverly Hills, California. (Photo by Steve Granitz/WireImage)
BEVERLY HILLS, CALIFORNIA - JANUARY 06: Irina Shayk and Bradley Cooper attend the 76th Annual Golden Globe Awards at The Beverly Hilton Hotel on January 06, 2019 in Beverly Hills, California. (Photo by David Crotty/Patrick McMullan via Getty Images)
BEVERLY HILLS, CALIFORNIA - JANUARY 06: Irina Shayk and Bradley Cooper attends the 76th Annual Golden Globe Awards at The Beverly Hilton Hotel on January 06, 2019 in Beverly Hills, California. (Photo by Daniele Venturelli/WireImage)
PALM SPRINGS, CA - JANUARY 03: (L-R) Irina Shayk, Bradley Cooper, and Emily Blunt attend the 30th Annual Palm Springs International Film Festival Film Awards Gala at Palm Springs Convention Center on January 3, 2019 in Palm Springs, California. (Photo by Vivien Killilea/Getty Images for Palm Springs International Film Festival )
NEW YORK, NY - OCTOBER 24: Bradley Cooper and Irina Shayk are seen walking in soho on October 24, 2018 in New York City. (Photo by Raymond Hall/GC Images)
NEW YORK, NY - OCTOBER 04: Bradley Cooper and Irina Shayk are seen walking in Soho on October 4, 2018 in New York City. (Photo by Raymond Hall/GC Images)
NEW YORK, NY - OCTOBER 04: Actor Bradley Cooper and Irina Shayk are seen walking in soho on October 4, 2018 in New York City. (Photo by Raymond Hall/GC Images)
VENICE, ITALY - AUGUST 30: Bradley Cooper, Irina Shayk and their daughter Lea are seen arriving at the 75th Venice Film Festival on August 30, 2018 in Venice, Italy. (Photo by Photopix/GC Images)
NEW YORK, NY - MAY 07: Irina Shayk and Bradley Cooper attend 'Heavenly Bodies: Fashion & The Catholic Imagination', the 2018 Costume Institute Benefit at the Metropolitan Museum of Art on May 7, 2018 in New York City. (Photo by Taylor Hill/Getty Images)
NEW YORK, NY - MAY 07: Irina Shayk and Bradley Cooper attend the Heavenly Bodies: Fashion & The Catholic Imagination Costume Institute Gala at Metropolitan Museum of Art on May 7, 2018 in New York City. (Photo by George Pimentel/Getty Images)
NEW YORK, NY - MAY 07: Irina Shayk and Bradley Cooper at Metropolitan Museum of Art on May 7, 2018 in New York City. (Photo by Jackson Lee/Getty Images)
NEW YORK, NY - MAY 07: Bradley Cooper and Irina Shayk attend the Heavenly Bodies: Fashion & The Catholic Imagination Costume Institute Gala at The Metropolitan Museum of Art on May 7, 2018 in New York City. (Photo by Dia Dipasupil/WireImage)
LONDON, ENGLAND - JULY 10: Bradley Cooper and Irina Shayk look on prior to the Men's Singles Final match between Andy Murray of Great Britain and Milos Raonic of Canada on day thirteen of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 10, 2016 in London, England. (Photo by Julian Finney/Getty Images)
LONDON, ENGLAND - JULY 06: Bradley Cooper and Irina Shayk attend day nine of the Wimbledon Tennis Championships at Wimbledon on July 06, 2016 in London, England. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - JULY 08: Bradley Cooper and Irina Shayk attend day eleven of the Wimbledon Tennis Championships at Wimbledon on July 08, 2016 in London, England. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - JULY 06: Bradley Cooper and Irina Shayk attend day nine of the Wimbledon Tennis Championships at Wimbledon on July 06, 2016 in London, England. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - JULY 06: Bradley Cooper and Irina Shayk attend day nine of the Wimbledon Tennis Championships at Wimbledon on July 06, 2016 in London, England. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - JULY 06: Bradley Cooper and Irina Shayk attend day nine of the Wimbledon Tennis Championships at Wimbledon on July 06, 2016 in London, England. (Photo by Karwai Tang/WireImage)
NEW YORK, NY - MAY 02: Irina Shayk and Bradley Cooper attend 'Manus x Machina: Fashion in an Age of Technology' Costume Institute Gala at Metropolitan Museum of Art on May 2, 2016 in New York City. (Photo by James Devaney/GC Images)
NEW YORK, NY - MAY 02: Actor Bradley Cooper (L) and model Irina Shayk leave the 'Manus x Machina: Fashion In An Age Of Technology' Costume Institute Gala at the Metropolitan Museum Of Art on May 2, 2016 in New York City. (Photo by Ray Tamarra/GC Images)
PARIS, FRANCE - MARCH 09: Irina Shayk and Bradley Cooper attend the Arop Charity Gala At the Opera Garnier under the auspices of Madam Maryvonne Pinault on March 9, 2016 in Paris, France. (Photo by Bertrand Rindoff Petroff/Getty Images)
PARIS, FRANCE - MARCH 08: Bradley Cooper and Irina Shayk attends the Red Obsession party in Paris to celebrate L'Oreal Paris's partnership with Paris Fashion Week. L'Oreal Paris spokesmodels accessorised with accents of red to celebrate the launch of the new Color Riche La Palette on March 8, 2016 in Paris, France. (Photo by David M. Benett/Dave Benett/Getty Images For L'Oreal)
PARIS, FRANCE - MARCH 08: Bradley Cooper and Irina Shayk attend the L'Oreal Red Obsession Party as part of the Paris Fashion Week Womenswear Fall/Winter 2016/2017 on March 8, 2016 in Paris, France. (Photo by Bertrand Rindoff Petroff/Getty Images)
PARIS, FRANCE - MARCH 08: Cyril Chapuy, Lewis Hamilton, Bradley Cooper Irina Shayk attend the Red Obsession party to celebrate L'Oreal Paris's partnership with Paris Fashion Week on March 8, 2016 in Paris, France. L'Oreal Paris spokesmodels accessorised with accents of red to celebrate the launch of the new Color Riche La Palette. (Photo by David M. Benett/Dave Benett/Getty Images For L'Oreal)
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Cooper and co-star Lady Gaga filmed the Oscar-winning film in 2017, and their intense chemistry both on screen and during the subsequent 2018-2019 awards season raised a lot of eyebrows, prompting speculation that their romance continued off camera. 

Gaga put to rest any rumors of a romance between them following their intense performance of "Shallow" at the Oscars in February.

"People saw love, and guess what? That's what we wanted you to see," she said on "Jimmy Kimmel Live" after the Academy Awards.

Also making it difficult to know what was really going on was the simple fact that Cooper and Shayk maintained extreme privacy throughout their four-year romance. 

"Since Bradley and Irina have always been very private about their relationship, few knew there was really for sure something going on," the People source explained.

SEE ALSO: Irina Shayk all smiles at the airport following Bradley Cooper split 

Cooper did shed a bit of light on how the immersive filmmaking process affected their relationship, though, while accepting the BAFTA award for best original music. During his speech, the actor said, "Most of all I have to thank Irina, for putting up with me for all the music I was trying to make in our basement for a year. Thank you very much."

After awards season wound down, sources said that "Cooper slowed down to focus on his family" and "spent every day" with Shayk and their daughter, Lea De Seine, 2.

But, in the end, his efforts weren't enough, despite Shayk having "high hopes" for her future with the actor.

"Recently Irina decided enough is enough. She didn't feel she was getting the level of commitment she wanted and the endless fighting made their life unbearable," a source told ET. "They are very different people and once they realized it was the baby that was holding them together, it was time to call it quits."

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Oscars 2019: Lady Gaga and Bradley Cooper perform
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Oscars 2019: Lady Gaga and Bradley Cooper perform
THE OSCARS® - The 91st Oscars® broadcasts live on Sunday, Feb. 24, 2019, at the Dolby Theatre® at Hollywood & Highland Center® in Hollywood and will be televised live on The ABC Television Network at 8:00 p.m. EST/5:00 p.m. PST. (Ed Herrera via Getty Images)LADY GAGA, BRADLEY COOPER
HOLLYWOOD, CALIFORNIA - FEBRUARY 24: (L-R) Lady Gaga and Bradley Cooper perform onstage during the 91st Annual Academy Awards at Dolby Theatre on February 24, 2019 in Hollywood, California. (Photo by Kevin Winter/Getty Images)
Best Original Song nominees for 'Shallow' from 'A Star is Born' Lady Gaga embraces actor Bradley Cooper (R) as she accepts the award for Best Original Song during the 91st Annual Academy Awards at the Dolby Theatre in Hollywood, California on February 24, 2019. (Photo by VALERIE MACON / AFP) (Photo credit should read VALERIE MACON/AFP/Getty Images)
THE OSCARS® - The 91st Oscars® broadcasts live on Sunday, Feb. 24, 2019, at the Dolby Theatre® at Hollywood & Highland Center® in Hollywood and will be televised live on The ABC Television Network at 8:00 p.m. EST/5:00 p.m. PST. (Ed Herrera via Getty Images) LADY GAGA, BRADLEY COOPER
HOLLYWOOD, CALIFORNIA - FEBRUARY 24: (L-R) Lady Gaga and Bradley Cooper perform onstage during the 91st Annual Academy Awards at Dolby Theatre on February 24, 2019 in Hollywood, California. (Photo by Kevin Winter/Getty Images)
HOLLYWOOD, CALIFORNIA - FEBRUARY 24: (EDITORS NOTE: Retransmission with alternate crop.) (L-R) Bradley Cooper and Lady Gaga perform onstage during the 91st Annual Academy Awards at Dolby Theatre on February 24, 2019 in Hollywood, California. (Photo by Kevin Winter/Getty Images)
HOLLYWOOD, CALIFORNIA - FEBRUARY 24: (L-R) Lady Gaga and Bradley Cooper perform onstage during the 91st Annual Academy Awards at Dolby Theatre on February 24, 2019 in Hollywood, California. (Photo by Kevin Winter/Getty Images)
THE OSCARS® - The 91st Oscars® broadcasts live on Sunday, Feb. 24, 2019, at the Dolby Theatre® at Hollywood & Highland Center® in Hollywood and will be televised live on The ABC Television Network at 8:00 p.m. EST/5:00 p.m. PST. (Craig Sjodin via Getty Images)LADY GAGA, BRADLEY COOPER
HOLLYWOOD, CALIFORNIA - FEBRUARY 24: (L-R) Bradley Cooper and Lady Gaga perform onstage during the 91st Annual Academy Awards at Dolby Theatre on February 24, 2019 in Hollywood, California. (Photo by Kevin Winter/Getty Images)
HOLLYWOOD, CALIFORNIA - FEBRUARY 24: (L-R) Bradley Cooper and Lady Gaga perform onstage during the 91st Annual Academy Awards at Dolby Theatre on February 24, 2019 in Hollywood, California. (Photo by Kevin Winter/Getty Images)
THE OSCARS® - The 91st Oscars® broadcasts live on Sunday, Feb. 24, 2019, at the Dolby Theatre® at Hollywood & Highland Center® in Hollywood and will be televised live on The ABC Television Network at 8:00 p.m. EST/5:00 p.m. PST. (Ed Herrera via Getty Images) LADY GAGA, BRADLEY COOPER
HOLLYWOOD, CALIFORNIA - FEBRUARY 24: (L-R) Bradley Cooper and Lady Gaga perform onstage during the 91st Annual Academy Awards at Dolby Theatre on February 24, 2019 in Hollywood, California. (Photo by Kevin Winter/Getty Images)
HOLLYWOOD, CALIFORNIA - FEBRUARY 24: (L-R) Lady Gaga and Bradley Cooper perform onstage during the 91st Annual Academy Awards at Dolby Theatre on February 24, 2019 in Hollywood, California. (Photo by Kevin Winter/Getty Images)
HOLLYWOOD, CALIFORNIA - FEBRUARY 24: (L-R) Lady Gaga and Bradley Cooper perform onstage during the 91st Annual Academy Awards at Dolby Theatre on February 24, 2019 in Hollywood, California. (Photo by Kevin Winter/Getty Images)
THE OSCARS® - The 91st Oscars® broadcasts live on Sunday, Feb. 24, 2019, at the Dolby Theatre® at Hollywood & Highland Center® in Hollywood and will be televised live on The ABC Television Network at 8:00 p.m. EST/5:00 p.m. PST. (Ed Herrera via Getty Images)LADY GAGA, BRADLEY COOPER
HOLLYWOOD, CALIFORNIA - FEBRUARY 24: (L-R) Lady Gaga and Bradley Cooper perform onstage during the 91st Annual Academy Awards at Dolby Theatre on February 24, 2019 in Hollywood, California. (Photo by Kevin Winter/Getty Images)
HOLLYWOOD, CALIFORNIA - FEBRUARY 24: (L-R) Lady Gaga and Bradley Cooper perform onstage during the 91st Annual Academy Awards at Dolby Theatre on February 24, 2019 in Hollywood, California. (Photo by Kevin Winter/Getty Images)
HOLLYWOOD, CALIFORNIA - FEBRUARY 24: (L-R) Lady Gaga and Bradley Cooper perform onstage during the 91st Annual Academy Awards at Dolby Theatre on February 24, 2019 in Hollywood, California. (Photo by Kevin Winter/Getty Images)
HOLLYWOOD, CALIFORNIA - FEBRUARY 24: (L-R) Bradley Cooper and Lady Gaga perform onstage during the 91st Annual Academy Awards at Dolby Theatre on February 24, 2019 in Hollywood, California. (Photo by Kevin Winter/Getty Images)
HOLLYWOOD, CA - FEBRUARY 24: In this handout provided by A.M.P.A.S., Bradley Cooper and Lady Gaga perform onstage during the 91st Annual Academy Awards at the Dolby Theatre on February 24, 2019 in Hollywood, California. (Photo by Matt Petit - Handout/A.M.P.A.S. via Getty Images)
THE OSCARS® - The 91st Oscars® broadcasts live on Sunday, Feb. 24, 2019, at the Dolby Theatre® at Hollywood & Highland Center® in Hollywood and will be televised live on The ABC Television Network at 8:00 p.m. EST/5:00 p.m. PST. (Ed Herrera via Getty Images) LADY GAGA, BRADLEY COOPER
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