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."