The Kardashian Family: Then & Now

The Scott-Kourtney relationship continues to crumble.

Kourtney Kardashian's ex isn't here for her lies.

In a sneak peek at Sunday's new "Keeping Up with the Kardashians," Scott Disick confronts his baby mama over getting him banned from attending Khloe Kardashian's birthday party.

"F--k, I didn't even get invited to her birthday. And I'm family. That was really sweet. That made me feel really good," he said while speaking with Kourt and Kim Kardashian after the celebration.

"There's only one person that would have gotten me not invited and that's Kourtney. I highly doubt that Khloe was like, 'The last person I'd want at my surprise party would be Scott,'" he went on. "It's cool. Honestly, I called my sister and I hung out with her the whole night. And then actually I called my mom after and was, 'Hey mom, do you want to come over because I'm feeling a little down and lonely because the family that claims I'm still blood even though we're not together still doesn't invite me to a surprise party.' But I really felt good about it."

He was clearly being sarcastic, as Disick's mother passed away in 2013 and he has no siblings.

After Scott said he would have "wanted to be there' for Khloe, Kourtney lied when explaining why he wasn't invited. "I didn't want to have you coming to the birthday and be photographed going in."

"I'm a little bit caught off guard and I just said that I didn't want to be photographed even though that's really not what I meant," she admitted in a confessional. "I just try to be positive. I didn't want to say I just didn't want you there. So if I can't say anything nice I just won't say anything at all."

Scott saw right through her excuse though, telling her, "That's all bulls—t. It's funny to realize just how fake you really are though."

Tensions between the two have escalated all season long, reaching peak strain when Disick showed up to Cannes with Bella Thorne while Kourtney attended with younger beau Younes Bendjima. The two recently spoke about the status of their relationship during the 10-year anniversary special, where she shot down any shot of a reconciliation.

"The debauchery that's gone on has definitely closed the door several billion times," she said at the time. "He does [get better] for a time period, he can't be consistent."

"Keeping Up with the Kardashians" airs Sundays at 9pm on E!

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