Scott Disick Shares New Details About Sofia Richie Split On 'KUWTK'; Ex Wanted 'Kourtney Out'

Scott Disick may have chosen Kourtney Kardashian over Sofia Richie, that's why his relationship with the much younger model ended.

In the premiere episode of "Keeping Up With the Kardashians" Thursday, the Talentless founder discussed his separation from Richie with Kim Kardashian and Khloe Kardashian. He admitted that she gave him an "ultimatum" and made him chose between her and Kourtney.

"I thought I would give it a try and make her more of a priority, but then even when doing that, I feel like she just started wanting to push Kourtney out," he told the Kardashian sisters. "And I said like, that's the most important thing to me is my kids and that's my family, and the only family I have, including you guys along with it."

Richie was bothered with his close relationship with the mother of his kids. So, she made him choose between her and Kourtney.

"She was like, 'I don't want to share you as a boyfriend with Kourtney. And then she literally said with an ultimatum: 'You have to choose me or Kourtney," Disick added.

Disick explained to Richie that Kourtney and their kids are a "unit." After Richie gave him an ultimatum, he realized that their relationship wont' work saying it was "impossible" to keep carrying on with it. He said in a confessional that he would never cut his relationship with Kourtney. Disick and Kourtney share three children together — sons Mason, 11, Reign, 6, and daughter Penelope, 8.

"I'm never going to give up my relationship with Kourtney and the co-parenting we have, nothing in a million years, will be worth what we have," he said. "And I truthfully believe if the right person were to even come along into Kourtney's life, or my life, us having children and having this amazing relationship would only be a plus to the outsider," he added.

When Kim advised Disick that sometimes it's just time to cut the cord, he agreed. He also said he needed to be with somebody he can trust with all of his heart and added, "I trust Kourtney with my life."

In the sneak peek at the final season of "KUWTK," Disick already said Kourtney had something to do with his split from Richie. In the clip, he said he made it clear to Richie that his priority has been his children and his life with them. He also told Kourtney, "I even put it out there that taking care of you is one of my priorities."