Kourtney Kardashian hasn't been on the best of terms with her sisters lately—but when did things start to go wrong? In this sneak peek clip of tonight's brand-new episode of Keeping Up With the Kardashians, Kendall Jenner reveals her theory: that Kourt's turmoil can be traced back to her break-up from Scott Disick.
She shares her theory with Khloe Kardashian and Scott himself, though he immediately dismisses it. "I'm just saying, I think that whole situation might've mentally f--ked her and I don't think she dealt with it," Kendall says.
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