READ: Charlie Puth blasts Justin Bieber at Dallas concert "f**k you"

"Justin knows Taylor doesn’t like him and never will and the feeling is mutual, but he is smart enough to know not to say anything in public or on social media because he knows all the scrutiny he’d endure,” a source tells HollywoodLife.com. Oh my God, that would a big war between the Swifties and the Biebs.

"He never expects to be her friend and is not looking to be her friend. He blames Taylor for some of his issues with Selena and that will never go away,” our insider adds.

READ: Chris Brown tells Justin Bieber "stick with Selena or lose her forever"

At the recent iHeartRadio Music Awards, Taylor threw major shade Justin's way by not even clapping or acknowledging his performance at the show!

As for Taylor being a problem in his relationship with Selena, who can blame the singer for looking out for her BFF after Justin has broken Selena’s heart countless times. Taylor will always be there for her friend, but it’s become so frustrating how Jelena keeps switching off and on.

Whatever happened to "If he's what that makes my friend happy. Then I am also happy?"

Watch Justin Bieber in 'Sorry' below: