On Monday Justin sent a heated message to his fans – knows as the Beliebers – telling them to stop sending negative messages to his rumoured new girlfriend Sofia Richie, or else he'd set his social media profiles to private.
But Selena, who dated Justin on and off for nearly four years, was quick to call him out for being ungrateful, warning him not to put his loyal followers second to a girl. She wrote: "Don't be mad at your fans. They love you. They were there for you before anyone."
The former lovers continued to exchange loaded comments, in which Justin seemed to accuse Selena of using him for attention and she responded by suggesting he "cheated multiple times." While Selena kept her accusation cryptic, Justin later quipped: "I cheated… oh and I forgot about you and Zayn?"
During their very public fallout, Justin's fans took to social media to plan a "blackout" to teach him a lesson for hurting their feelings with the initial threat. But, after he made the decision to delete his Instagram account, turning his back on more than 77million followers, the Beliebers hatched a new plan.
One wrote: "When Justin decides to pick a 17 year old girl over his Beliebers… #JustinDeactivatedParty." And another said: "I can't believe Justin hates us enough to deactivate his Instagram. I'm shook."