The 'Good For You' hitmaker found herself in a war of words with the 'Sorry' singer where she alleged he had cheated on her during their on off relationship but now seems to be regretting her comments, which led to Justin deactivating his Instagram account.
Taking to Snapchat, she wrote: "What I said was selfish and pointless."
Their bitter spat kicked off when the 22-year-old singer threatened his fans that he'd make his account private if they didn't stop hating on his rumoured girlfriend Sofia Richie.
Under the comment, Selena had something to say and wrote: "If you can't handle the hate then stop posting pictures of your girlfriend lol - it should be special between you two only. Don't be mad at your fans. They love you (sic)."
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But Justin was hardly enamoured by her response and slammed the 24-year-old star, claiming she used him.
He wrote: "It's funny to see people that used me for attention and still try to point the finger this way. Sad. All love. I'm not one for anyone receiving hate. Hope u all can be kind to my friends and each other. And yes I love my beliebers (sic)."
Then the pair's argument turned to claims about cheating, where Selena accused the singer of being unfaithful.
In retaliation, he wrote: "I cheated...Oh and I forgot about you and Zayn (sic)," appearing to reference former One Direction star Zayn Malik.