In today's edition of celebrity couples we forgot were once together, Kiefer Sutherland opens up about his one-time engagement to America's Sweetheart Julia Roberts.

The two met on the set of 1990's "Flatliners " movie and, not long after Sutherland divorced his first wife, the two became engaged. But in a real-life "Runaway Bride" scenario, Roberts called off their engagement just days before their June 1991 wedding.

Sutherland spoke about his former fiancée in a new interview with Entertainment Weekly and People's Jess Cagle and explained why he was "grateful" that the actress ended their relationship.

Ron Galella, Ltd. via Getty Images

"I think she was being realistic for herself and I think that's much better," Sutherland said, before pausing. "I think it's hard to explain the pressure. We were young and we were both very much in love and we had decided that we wanted to get married."

But after Robert's fame continued to soar, their future as husband and wife became unclear.

"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," Sutherland said. "And then in the middle of that I think she had the courage ― it wasn't what she wanted to do in the end. And I think it took a lot of courage, in amongst all that other stuff, to be able to say, 'I can't do this.' And I'm gonna leave it at that."

We'll let you insert "Runaway Bride" jokes here.