She and her mum Kris Jenner were speaking about Scott being upset she was hanging out with lots of people during her birthday trip to Mexico, and Kourtney said: "He needs to get a fucking life, he needs to leave me alone".
"Could you stop with this shit and actually start spending time with your kids again? I'm just giving you a heads up, should I not do that?'" Kourtney recounted to her sister. "Sofia is really into him", says the insider.
The report added that Sofia Richie is looking for a more serious relationship and Scott was more reluctant but agreed to be her boyfriend.
Scott Disick and Kourtney Kardashian's relationship drama continued to play a central role on Sunday's new Keeping Up With the Kardashians, as Scott struggled to come to terms with the idea of his ex-girlfriend dating other people. He complained to Kris that Kourtney is "allowed" to throw up in the bed but when he does it he has to go to rehab, seemingly forgetting that he himself has said things like, "My issues are bigger than me".
Do you think Kourtney Kardashian and Scott Disick would get back together?
The whole drama started when photographers caught her out to dinner with another guy and, attempting to get ahead of the story, she made a decision to give Scott a heads up.
"He still has Kourtney at the top of his mind all the time, and he is still texting and flirting with other girls", the source added.
For the uninitiated, the reality star and Disick were seen having a tough phase in the ongoing season of their reality show. In fact, sources claim that she's happy if he's happy.