It all began when some fans trolled Justin's and Sofia's romance. He responded with threats about his Instagram account, and that's when Gomez showed up to the party.
"If you can't handle the hate, then stop posting pictures of your girlfriend," shaded Selena. "It should be special between you two only. Don't be mad at your fans. They love you and supported you before [anyone] else did."
Ouch. The hashtag #SelenaEndedJustinParty began to trend on Twitter, and Bieber bit back at Gomez, claiming she used him to get attention for herself.
"It's funny to see people that used me for attention and still try to point the finger this way," he snarked. "Sad. All love."
Selena had her own snark to share, however, accusing Justin of cheating.
"Funny how the ones that cheated multiple times, are the ones pointing the finger at the ones that were forgiving and supportive."
Justin responded to those allegations of cheating from the "Kill 'Em With Kindness" singer by claiming that Gomez had cheated on him with Zayn Malik.
"I cheated.. oh I forgot about You and Zayn?" he questioned.
The comment wasn't completely out of left field, because Selena had previously discussed dating Zayn.
"If he had asked me out on a date, I would be seen with him. Just kidding, but not kidding," added Gomez.