Entertainment TV Tension over Tyga's Cheating Led to Kylie Jenner Split: 'He Was Lying Repeatedly to Her Face,' Says Source "She couldn't trust a word he said," a Jenner source tells PEOPLE By Melody Chiu Melody Chiu Instagram Twitter Melody Chiu is a Senior Editor for PEOPLE. She has been with the brand since 2009, editing, writing and reporting across all entertainment verticals. She oversees PEOPLE's music and events coverage and has written cover stories on Taylor Swift, Selena Gomez, Melissa McCarthy, Blake Shelton and Sandra Oh. The Los Angeles native graduated from the University of Southern California and has appeared on Extra!, The Talk, Access Hollywood and Good Morning America. People Editorial Guidelines Published on May 13, 2016 04:10 PM Share Tweet Pin Email Photo: Source: Kylie Jenner/Instagram brightcove.createExperiences(); Keeping up with the Kardashians is all about the drama, but even Kylie Jenner has a limit. 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.