According to a source, the reality star, 18, and her ex Tyga, 26, "were fighting a ton over stupid, petty bulls---" over the last few months, and "she was over it."
Coupled with trust issues that "made her feel insecure about their relationship" and added tension because of her brother Rob Kardashian's engagement to Tyga's ex Blac Chyna, Jenner decided to end her relationship of two years.
"He was lying repeatedly to her face and she just couldn't take it anymore," says the source. "She couldn't trust a word he said."
Digging into Tyga and the KarJenners' Complicated History
In November, the duo briefly split because of trust issues as well. "She's caught him lying and talking to other girls behind her back before, and this was the last straw," a source said at the time. "She feels super betrayed and is just so pissed off, damaged and hurt about it."
On Thursday, the newly single star partied with her sister Kourtney Kardashian's ex, Scott Disick. Hanging out at a private table at the Nylon Young Hollywood Party at Hyde Sunset Kitchen in L.A., she "seemed to be in a good mood," says an onlooker.
