OK! Exclusive: Battle Of The 'It' Girls! Why Taylor Swift & Kendall Jenner Will Never Be Friends

It used to be mad love but now they’ve got bad blood! Taylor Swift and Kendall Jenner will not be seen in the same friend circle anytime soon, thanks to distrust, selfishness, and ex-boyfriends!

Though they are both beautiful and successful, it looks like there can only be room for one, as tensions between Taylor and Kendall “have been mounting for a long time,” a source tells OK! Magazine exclusively, thanks in part to Kendall’s relationship with Taylor’s ex Harry Styles.

“Harry’s always been the biggest issue between them,” says the insider. “Taylor thinks it was completely disrespectful for Kendall to be hooking up with Harry after he broke Taylor’s heart.” And Harry is not the only guy Kendall has gotten too close for comfort with!

Taylor is not too happy about Kendall’s relationship with Justin Bieber, as she is very good friends with Selena Gomez. A source says Taylor even thinks the leggy model came between Justin and Selena and that she “can’t be trusted.”

Considering Taylor and Kendall have mutual friends, including Gigi Hadid and Cara Delevingne, this feud must really be a pain for their pals, who may have to make a choice in the Kaylor divorce soon.

But have they already made their choice? A ton of Taylor’s A-lister friends, including Gigi and Cara, united for her latest music video “Bad Blood,” with Kendall noticeably absent.

Says a source, “She could have participated, she just decided not to…Kendall’s so consumed with herself.”