Kourtney Kardashian's breakup from her partner of nine years, Scott Disick, is unfolding before viewers eyes this season on "Keeping Up With the Kardashians." A sneak peak of this Sunday's episode shows Scott sitting down with the matriarch of the family, Kris Jenner, as the two talk about his relationship with Kourtney.

When Scott arrives at Kris' house, he tells her that that Kourtney took the bar codes off of all his cars so he couldn't get into the house, according to E!. The momager tells Scott that she feels like she is "missing a piece of the story."

"So am I!" Disick says. "Every single day I was driving there, sitting with [the kids] all day, every day."

Kris then decides to get Kourtney on the phone to try and straighten the situation out. On speakerphone, Kris asks Kourtney why she locked Scott out because he "thought there was an open door policy that he could come by whenever," Kris says to her eldest daughter.

"There was, but that has changed," Kourtney tells Kris over the phone. "He was flaking too often, every time I tried to have him sit and have dinner with them he sits in the other room on his phone. He flaked on going to the kid's first day of school, he says 'I can't go because I hate school s--t, I get anxious.' When really he went out and partied through the next day, just like a real f--king a--hole."

"His main concern is himself, not the kids and that's what's important here is the kids," Kourtney adds.

"Keeping Up With the Kardashians" airs Sundays at 9 p.m. on E!.

Check out the emotional clip below.