Kiefer Sutherland reveals why Julia Roberts ended their engagement in 1991

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Kiefer Sutherland is opening up about his terminated engagement to Julia Roberts, whom he says he was "very much in love" with.

The stars met on the set of the 1990 flick "Flatliners," and subsequently got engaged. They were set to wed during the summer of 1991 before Roberts suddenly called off the wedding, and now we know what happened.

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"We were young and we were both very much in love," Sutherland told People magazine's Jess Cagle during a recent edition of "The Jess Cagle Interview," which you can watch above. "We had decided we wanted to get married, but then this other thing kind of took over. She was arguably the most famous woman in the world, and this wedding that was supposed to be something between the two of us became something so big."

He's right: Dubbed "America's sweetheart," Roberts was the biggest female movie star in the world during that time, with an entire world of people watching her every move. Her wedding would've turned into a media circus.

See photos of Julia Roberts and Kiefer Sutherland together:

15 PHOTOS
Kiefer Sutherland and Julia Roberts together
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Kiefer Sutherland and Julia Roberts together
American actress Julia Roberts and her partner, actor Kiefer Sutherland attend the 63rd Academy Awards. (Photo by Richard Perry/Sygma via Getty Images)
Julia Roberts and Kiefer Sutherland (Photo by Ron Galella/WireImage)
LOS ANGELES - MAY 27: Actress Julia Roberts and actor Kiefer Sutherland attend Sandy Gallin's 50th Birthday Party on May 27, 1990 at Eureka Brewery & Restaurant in Los Angeles, California. (Photo by Ron Galella, Ltd./WireImage)
Julia Roberts and Kiefer Sutherland during Julia Roberts and Kiefer Sutherland at Los Angeles International Airport - June 10, 1990 at Los Angeles International Airport in Los Angeles, California, United States. (Photo by Ron Galella/WireImage)
WESTWOOD, CA - JULY 2: Actress Julia Roberts and actor Kiefer Sutherland attend the 'Die Hard 2' Westwood Premiere on July 2, 1990 at Avco Centre Cinemas in Westwood, California. (Photo by Ron Galella, Ltd./WireImage)
Kiefer Sutherland and Julia Roberts (Photo by S. Granitz/WireImage)
Kiefer Sutherland and Julia Roberts during 'Flatliners' Premiere at Mann's Chinese Theater in Hollywood, California, United States. (Photo by Barry King/WireImage)
Kiefer Sutherland and Julia Roberts during 'Flatliners' Premiere at Mann's Chinese Theater in Hollywood, California, United States. (Photo by S. Granitz/WireImage)
American actors attend the 16th Deauville Film Festival. L-R: Michael Douglas, Kiefer Sutherland, Julia Roberts, Joel Schumacher (the director) and William Baldwin. (Photo by Micheline Pelletier/Sygma via Getty Images)
Kiefer Sutherland and Julia Roberts (Photo by S. Granitz/WireImage)
089043 03: Actor Kiefer Sutherland and actress Julia Roberts arrive at the 'Sleeping With the Enemy' premiere in Los Angeles, CA., February 4, 1991. (Photo by Barry King/Liaison)
Kiefer Sutherland and Julia Roberts during Film Premiere of 'Sleeping with the Enemy' at Mann's Village Theatre in Westwood, California, United States. (Photo by Ron Galella, Ltd./WireImage)
092976 01: Actor Kiefer Sutherland and actress Julia Roberts go for a walk in Los Angeles, CA., March 23, 1991. (Photo by Bob Scott/Liaison)
Julia Roberts & Kiefer Sutherland at the Shrine Auditorium in Los Angeles, California (Photo by Kevin Mazur/WireImage)
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"Then, in the middle of that, I think she had the courage -- it wasn't what she wanted to do in the end," he continued to tell Cagle. "I think it took a lot of courage, even amongst all of that other stuff, to be able to say, 'I can't do this.'"

While he reflected on his relationship with the movie star, who has been married to director Daniel Moder for 12 years, Sutherland seemed to have nothing but good things to say about her. After all, their love was one shared between two young actors who weren't really sure what they wanted. At the end of the day, Sutherland appeared to respect her decision.

"I think she was being realistic for herself," the 49-year-old actor concluded. "I think that's much better."

See more vintage photos of Julia Roberts:

30 PHOTOS
Vintage photos of Julia Roberts
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Vintage photos of Julia Roberts
145819 91 ***EXCLUSIVE*** TABLOIDS OUT Actress Julia Roberts poses for a studio portrait September 15, 1989 in New York City. (Photo by Jacques Malignon/Getty Images)
145819 19 ***EXCLUSIVE*** TABLOIDS OUT Actress Julia Roberts poses for a studio portrait September 15,1989 in New York City. (Photo by Jacques Malignon/Getty Images)
145819 33 ***EXCLUSIVE*** TABLOIDS OUT Actress Julia Roberts poses for a studio portrait September 15,1989 in New York City. (Photo by Jacques Malignon/Getty Images)
Stars of the film Steel Magnolias pose backstage at the Ziegfeld Theater in New York Nov. 5, 1989 at the movie's premiere. Shown from left: Dolly Parton, Sally Field, Olympia Dukakis, Shirley MacLaine, Julia Roberts and Daryl Hannah. (AP Photo/Ed Bailey)
NEW YORK CITY - NOVEMBER 5: Musician Dolly Parton and Actress Julia Roberts attend the 'Steel Magnolias' New York City Premiere on November 5, 1989 at Ziegfeld Theater in New York City, New York. (Photo by Ron Galella, Ltd./WireImage)
NEW YORK CITY - NOVEMBER 5: Actress Julia Roberts attend the 'Steel Magnolias' Premiere Party on November 5, 1989 at New York Hilton Hotel in New York City. (Photo by Ron Galella, Ltd./WireImage)
Actors Julia Roberts and John Malkovich announce their upcoming collaboration on the Stephen Frears film 'Mary Reilly', 1st June 1994. (Photo by Dave Benett/Getty Images)
Actor Kiefer Sutherland and actress Julia Roberts attend the 62nd Annual Academy Awards on March 26, 1990 at Dorothy Chandler Pavilion, Music Center in Los Angeles, California. (Photo by Kypros/Getty Images)
SATURDAY NIGHT LIVE -- Episode 16 -- Air Date 04/06/2002 -- Pictured: (l-r) Dean Edwards as Denzel Washington, Amy Poehler as Julia Roberts, Maya Rudolph as Halle Berry, during 'Weekend Update' on April 6, 2002 (Photo by Mary Ellen Matthews/NBC/NBCU Photo Bank via Getty Images)
American actress Julia Roberts holds her Golden Globe award for Best Performance by an Actress in a Supporting Role - Motion Picture at the 47th Annual Golden Globe Awards, held at the Beverly Hilton Hotel, Beverly Hills, California, January 20, 1990. (Photo by Darlene Hammond/Getty Images)
circa 1995: Portrait of American actress Julia Roberts wearing a floral print jacket. (Photo by Fotos International/Getty Images)
Julia Roberts smiles during the curtain call at the Broadway opening of "Three Days of Rain," which also stars Paul Rudd and Bradley Cooper, Wednesday, April 19, 2006, in New York. (AP Photo/Diane Bondareff)
'Pret a Porter' by Robert Altman with Julia Roberts, 1994. (Photo by Etienne George/RDA/Getty Images)
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UNITED STATES - CIRCA 1991: Julia Roberts and Keifer Sutherland attending movie premiere in LA 1991 (Photo by Vinnie Zuffante/Getty Images)
UNITED STATES - MARCH 25: Julia Roberts & Keifer Sutherland attending the 63rd Academy Awards 03/25/91 (Photo by Vinnie Zuffante/Getty Images)
TODAY -- Pictured: Actress Julia Roberts talks about 'Charlie Wilson's War' and about the Golden Globe nominations on NBC News' Today, airing December 14, 2007 -- Photo by: Virginia Sherwood/NBC NewsWire
Julia Roberts & George Clooney (Photo by Jeff Kravitz/FilmMagic)
55TH ANNUAL GOLDEN GLOBE AWARDS -- Pictured: Golden Globe presenter Julia Roberts on stage during the 55th Annual Golden Globe Awards held at the Beverly Hilton Hotel on January 18, 1998 (Photo by Fitzroy Barrett/NBC/NBCU Photo Bank via Getty Images)
Actress Julia Roberts arrives at the 28th Annual People's Choice Awards held at the Pasadena Civic Auditorium in Los Angeles, Ca., Jan. 13, 2001. (photo by Kevin Winter/Getty Images)
"Ocean's Eleven" cast members George Clooney, left, and Julia Roberts face the cameras during the premiere of the film Wednesday, Dec. 5, 2001, in the Westwood section of Los Angeles. The fim is a remake of the 1960 heist movie that starred the Rat Pack. (AP Photo/Kevork Djansezian)
BEVERLY HILLS, CA - OCTOBER 17: Honoree Julia Roberts accepts the GLSEN Respect Humanitarian Award onstage during the 10th annual GLSEN Respect Awards at the Regent Beverly Wilshire Hotel on October 17, 2014 in Beverly Hills, California. (Photo by Jonathan Leibson/Getty Images for GLSEN Respect Awards-Los Angeles)
BEVERLY HILLS, CA - OCTOBER 17: Actress Julia Roberts arrives at the 10th Annual GLSEN Respect Awards at Regent Beverly Wilshire Hotel on October 17, 2014 in Beverly Hills, California. (Photo by Jon Kopaloff/FilmMagic)
386900 101: Actress Julia Roberts and her boyfriend, actor Benjamin Bratt arrive for the 73rd Annual Academy Awards March 25, 2001 at the Shrine Auditorium in Los Angeles. Bratt is wearing an Armani Suit and Roberts is wearing a vintage Valentino dress from 1982 with Van Cleef and Arpels jewelry. Her hair is by Serge Normant of the Jed Root Agency and her makeup is by Genivive Herr. (Photo by David McNew/Getty Images)
**FILE**Julia Roberts arrives at the 72nd Annual Drama League Awards Ceremony Friday May 5, 2006 in New York. Roberts may not have received a Tony nomination for her Broadway debut in "Three Days of Rain," but the actress will be on stage at the 60th annual Tony Awards when they are presented June 11, 2005, at Radio City Music Hall in New York.(AP Photo/Frank Franklin II)
Actress Julia Roberts presents the award for best director during the 77th Academy Awards Sunday, Feb. 27, 2005, in Los Angeles. (AP Photo/Mark J. Terrill)
Director Sidney Lumet greets Actress Julia Roberts at the Governors Ball following the 77th Academy Awards on Sunday, Feb. 27, 2005, in Los Angeles. Lumet received an honorary Oscar from the Academy of Motion Picture Arts and Sciences. (AP PhotoKevork Djansezian)
Actress Julia Roberts arrives at the premiere of "Charlotte's Web" in the Hollywood section of Los Angeles on Sunday, Dec. 10, 2006. (AP Photo/Matt Sayles)
LOS ANGELES, CA - AUGUST 25: Actress Julia Roberts arrives for the 66th Annual Primetime Emmy Awards held at Nokia Theatre L.A. Live on August 25, 2014 in Los Angeles, California. (Photo by Albert L. Ortega/Getty Images)
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