Shocking details emerge on Jennifer Garner's history with Ben Affleck's new girlfriend

Shocking new details are coming to light about Ben Affleck's history with his new girlfriend Lindsay Shookus. As it turns out, she may not be a new girlfriend, after all.

As reported by People, sources close to Affleck's ex-wife Jennifer Garner say that Affleck after had an affair with Shookus during their marriage back in 2013 -- a full two years before the A-list couple publicly announced their separation.

SEE ALSO: Ben Affleck is all smiles with Lindsay Shookus on casual dinner date: See the pics!

Not only that, but Shookus was also still married at the time. She split from Kevin Miller in 2014, a year after she reportedly started seeing Affleck. Miller and Shookus were both producers on "Saturday Night Live" together.

Garner reportedly found out about Affleck's affair in 2015, two years after it started, and she confronted Shookus about it during a trip to NYC.

See photos of Jennifer Garner and Ben Affleck together:

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Jennifer Garner and Ben Affleck
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Jennifer Garner and Ben Affleck
LOS ANGELES, CA - NOVEMBER 13: Jennifer Garner and Ben Affleck are seen on November 13, 2016 in Los Angeles, California. (Photo by BG004/Bauer-Griffin/GC Images)
LOS ANGELES, CA - MARCH 06: Jennifer Garner and Ben Affleck are seen on March 06, 2016 in Los Angeles, California. (Photo by Stone-e/Bauer-Griffin/GC Images)
LOS ANGELES, CA - OCTOBER 05: Jennifer Garner and Ben Affleck are seen on October 05, 2014 in Los Angeles, California. (Photo by GONZALO/Bauer-Griffin/GC Images)
LOS ANGELES, CA - OCTOBER 03: Ben Affleck and Jennifer Garner are seen on October 03, 2014 in Los Angeles, California. (Photo by GONZALO/Bauer-Griffin/GC Images)
WEST HOLLYWOOD, CA - MARCH 02: Actor/director Ben Affleck (L) and wife actress Jennifer Garner attend the 2014 Vanity Fair Oscar Party hosted by Graydon Carter on March 2, 2014 in West Hollywood, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - FEBRUARY 18: Ben Affleck and Jennifer Garner are seen holding hands on February 18, 2014 in Los Angeles, California. (Photo by Bauer-Griffin/GC Images)
LOS ANGELES, CA - FEBRUARY 06: Ben Affleck and Jennifer Garner are seen with their daughter, Seraphina Affleck on February 06, 2014 in Los Angeles, California. (Photo by GONZALO/Bauer-Griffin/GC Images)
LOS ANGELES, CA - JANUARY 18: Actors Jennifer Garner and Ben Affleck attend the 20th Annual Screen Actors Guild Awards at The Shrine Auditorium on January 18, 2014 in Los Angeles, California. (Photo by Christopher Polk/WireImage)
LOS ANGELES, CA - NOVEMBER 29: Ben Affleck and Jennifer Garner are seen on November 29, 2013 in Los Angeles, California. (Photo by Bauer-Griffin/GC Images)
LOS ANGELES, CA - November 07: Ben Affleck and Jennifer Garner are seen on November 07, 2013 in Los Angeles, California. (Photo by Bauer-Griffin/FilmMagic)
LOS ANGELES, CA - JULY 16: Ben Affleck and Jennifer Garner are seen on July 16, 2013 in Los Angeles, California. (Photo by Bauer-Griffin/GC Images)
SATURDAY NIGHT LIVE -- 'Ben Affleck' Episode 1641 -- Pictured: (l-r) Jennifer Garner and Ben Affleck during the monologue on May 18, 2013 -- (Photo by: Dana Edelson/NBC/NBCU Photo Bank via Getty Images)
LOS ANGELES, CA - MARCH 10: Actors Jennifer Garner (L) and Ben Affleck attend the John Varvatos 10th Annual Stuart House Benefit presented by Chrysler, Kids Tent by Hasbro Studios, at John Varvatos Los Angeles on March 10, 2013 in Los Angeles, California. (Photo by Donato Sardella/Getty Images for John Varvatos)
Argo director Ben Affleck kisses his wife actress Jennifer Garner after winning the Oscar for Best Movie at the 85th Annual Academy Awards on February 24, 2013 in Hollywood, California. AFP PHOTO/Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)
LONDON, ENGLAND - FEBRUARY 09: Ben Affleck (L) and Jennifer Garner attend the Charles Finch and Chanel Pre-BAFTA cocktail party and dinner at Annabel's on February 9, 2013 in London, England. (Photo by Dave M. Benett/Getty Images)
LOS ANGELES, CA - JANUARY 27: Ben Affleck and Jennifer Garner attend the 19th Annual Screen Actors Guild Awards at The Shrine Auditorium on January 27, 2013 in Los Angeles, California. (Photo by Kevin Mazur/WireImage) 23116_016_1209.jpg
LOS ANGELES, CA - NOVEMBER 30: Ben Affleck and Jennifer Garner are seen on November 30, 2012 in Los Angeles, California. (Photo by Bauer-Griffin/GC Images)
BEVERLY HILLS, CA - OCTOBER 05: Actors Ben Affleck and Jennifer Garner attend Variety's 4th Annual Power of Women Event Presented by Lifetime at the Beverly Wilshire Four Seasons Hotel on October 5, 2012 in Beverly Hills, California. (Photo by Amanda Edwards/WireImage)
BEVERLY HILLS, CA - OCTOBER 04: Actors Ben Affleck and Jennifer Garner arrive at the premiere of Warner Bros. Pictures' 'Argo' at AMPAS Samuel Goldwyn Theater on October 4, 2012 in Beverly Hills, California. (Photo by Jason Merritt/Getty Images)
TORONTO, ON - SEPTEMBER 07: Jennifer Garner and Ben Affleck attends 'Argo' Post Premiere Party - 2012 Toronto International Film Festival on September 7, 2012 in Toronto, Canada. (Photo by Sonia Recchia/Getty Images)
LOS ANGELES, CA - NOVEMBER 04: Ben Affleck and Jennifer Garner are seen on November 04, 2016 in Los Angeles, California. (Photo by BG004/Bauer-Griffin/GC Images)
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Though sources close to Affleck and Shookus contend that Jen and Lindsay "do not have any relationship," a Garner source counters that "Lindsay refused to back down or quit the affair" after the confrontation.

If Garner did indeed find out about the affair in 2015, that would place her realization in the same year that Affleck's reported affair with their family's nanny, Christine Ouzounian, came to light. In other words, Affleck may have been having two affairs at the same time.

The "13 Going on 30" star also allegedly talked to Shookus' ex, Miller, following an appearance on "Late Night with Seth Meyers." Garner approached Miller, who is a supervising producer on the late-night talk show, backstage after his split from Shookus to have a conversation and show him "proof" of the affair in the form of text messages between Affleck and Shookus.

The jaw-dropping details come after Affleck and Shookus have taken their relationship public, stepping out together three times in less than a week for a series of coffee and dinner dates.

See photos of Lindsay Shookus:

17 PHOTOS
Ben Affleck's new girlfriend, Lindsay Shookus
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Ben Affleck's new girlfriend, Lindsay Shookus
LOS ANGELES, CA - OCTOBER 24: Lindsay Shookus is seen on October 24, 2017 in Los Angeles, California. (Photo by BG004/Bauer-Griffin/GC Images)
NEW YORK - SEPTEMBER 30: Lindsay Shookus seen at the SNL Premiere After Party at TAO Uptown on September 30, 2017 in New York, New York. (Photo by Josiah Kamau/BuzzFoto via Getty Images)
LOS ANGELES, CA - SEPTEMBER 17: (L-R) Producers Erin Doyle, Lindsay Shookus, Lorne Michaels, Steve Higgins, and Erik Kenward, winners of Outstanding Variety/Sketch Series for 'Saturday Night Live,' pose in the press room at the 69th annual Primetime Emmy Awards at Microsoft Theater on September 17, 2017 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
LOS ANGELES, CA - SEPTEMBER 17: (L-R) Jeff Garlin, Charissa Thompson, Larry David, Lindsay Shookus and Ben Affleck attend the HBO's Official 2017 Emmy After Party at The Plaza at the Pacific Design Center on September 17, 2017 in Los Angeles, California. (Photo by Jeff Kravitz/FilmMagic)
NEW YORK, NY - SEPTEMBER 10: Ben Affleck (L) and Lindsay Shookus are seen in the Upper West Side on September 10, 2017 in New York City. (Photo by Gotham/GC Images)
NEW YORK, NY - SEPTEMBER 10: Ben Affleck and Lindsay Shookus attend the 2017 US Open Tennis Championships at Arthur Ashe Stadium on September 10, 2017 in New York City. (Photo by Jackson Lee/WireImage)
LOS ANGELES, CA - AUGUST 29: Lindsay Shookus is seen on August 29, 2017 in Los Angeles, California. (Photo by BG004/Bauer-Griffin/GC Images)
NEW YORK - AUGUST 22: Lindsay Shookus in a blue flower dress is seen leaving new boyfriend Ben Afleck's hotel in Manhattan on August 22, 2017 in New York, New York. (Photo by Josiah Kamau/BuzzFoto via Getty Images)
NEW YORK - JULY 19: Ben Affleck and Lindsay Shookus are seen leaving the Ritz-Carlton Hotel in Mid-Town Manhattan on July 19, 2017 in New York, New York. (Photo by Josiah Kamau/BuzzFoto via Getty Images)
NEW YORK - JULY 19: Lindsay Shookus is seen leaving the Ritz-Carlton Hotel in Mid-Town Manhattan on July 19, 2017 in New York, New York. (Photo by Josiah Kamau/BuzzFoto via Getty Images)
NEW YORK - JULY 19: Ben Affleck and Lindsay Shookus are seen leaving the Ritz-Carlton Hotel in Mid-Town Manhattan on July 19, 2017 in New York, New York. (Photo by Josiah Kamau/BuzzFoto via Getty Images)
NEW YORK CITY, NY - FEBRUARY 7: Lindsay Shookus and Alison Fast attend The New York Botanical Garden Orchid Dinner at Rainbow Room on February 7, 2008 in New York City. (Photo by JOE SCHILDHORN/Patrick McMullan via Getty Images)
NEW YORK CITY, NY - FEBRUARY 7: Lindsay Shookus and Diane Tierney attend The New York Botanical Garden Orchid Dinner at Rainbow Room on February 7, 2008 in New York City. (Photo by JASON AUGUSTINE/Patrick McMullan via Getty Images)
NEW YORK CITY, NY - NOVEMBER 16: (L-R) Lindsay Shookus, Seth Meyers and Erin David attend The Museum Gala at American Museum of Natural History on November 16, 2006 in New York City. (Photo by Will Ragozzino/Patrick McMullan via Getty Images)
NEW YORK CITY, NY - NOVEMBER 16: (L-R) Darrell Hammond, Lindsay Shookus and ? attend The Museum Gala at American Museum of Natural History on November 16, 2006 in New York City. (Photo by Will Ragozzino/Patrick McMullan via Getty Images)
NEW YORK, NY - FEBRUARY 7: (L-R) Patti Fast, Lindsay Shookus and Anne Miller attend The New York Botanical Garden 2006 Orchid Dinner at Rainbow Room on February 7, 2006 in New York City. (Photo by Matthew Carasella/Patrick McMullan via Getty Images)
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Though initial reports indicate that the pair were in the "early stages" of their relationship, this new information would directly contradict those details.

Affleck and Garner announced earlier this year that they would be officially filing for divorce, almost two years after initially announcing their separation. Throughout those two years, numerous reports surfaced that the former couple was trying to rekindle and work on their romance as Affleck continued to live in their pool house.

Jennifer Garner and Ben Affleck share three children together and were married were 12 years.

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