The couple have been dating since 2006 and have two children, UsMagazine.com said.
"I think if it's not broke, don't fix it. You know what I mean?" Disick said in an interview for the upcoming special "Ryan Seacrest With the Kardashians: An E! News Presentation."
"I would say we're decently happy," Disick said. "I feel like I used to want to get married more than she did, and then, being that she was always so not interested, I've decided not to be."
NBC reportedly holds celebs hostage to Jimmy Fallon's show
Aaron Carter is still in love with Hilary Duff