Taylor Swift and Kendall Jenner's feud may be far from over. According to Hollywood Life, the "Blank Space" singer is purportedly still mad at the "Keeping Up With The Kardashians" star for hooking up with her ex, Harry Styles, years ago.

Kendall Jenner reportedly never apologized to Taylor Swift about hooking up with Harry, and that purportedly got into Taylor's nerves.

"Taylor has no idea why Kendall would think she is a mean girl," a source reportedly said. "If anything, Taylor thinks Kendall needs a serious lesson or two in the girl code department. For starters, don't date your friends' exes!"

"Taylor has little patience for people who don't respect the meaning of friendship. She feels like if Kendall really valued their friendship, she would have never stabbed her in the back by dating the One Direction singer. It was a real low blow and till this day, Kendall has never apologized.

Taylor Swift also allegedly thinks Kendall Jenner is full of herself. "Taylor thinks she's been nothing but supportive of Kendall, introducing her to lots of influential people, but Kendall's so consumed with herself, she doesn't have time to reciprocate," a source reportedly told OK! Magazine.

Despite Taylor's complaints against her former friend, Kendall purportedly has grievances of her own towards the Grammy award-winning singer.

In fact, Taylor purportedly invited Kendall to be in her star-studded "Bad Blood" music video, along with Selena Gomez, Ellie Goulding, and other known personalities. But Kendall reportedly turned down the invitation not wanting to have anything to do with Taylor. Kendall's refusal allegedly caused an even bigger rift in their friendship.

"Kendall thinks Taylor is too full of herself and a control freak," a source reportedly spilled. "She thinks Taylor plays people against each other. She's happy to steer clear of her mean-girl games."