How do I handle my friend gloating that she got with my ex?

My ex dumped and cheated on me 2 months ago. Well, he cheated then I dumped him when I found out he cheated. I didn’t know that the night after we broke up, my “friend” hooked up with him. She lied to me at first saying she didn’t do anything with him, but I found out the truth eventually. And then she sent me a long message on Snapchat gloating, saying she’s going to make him fall in love with her and he never loved me, only wanted me for sex, etc.

they are both still in my circle of friends, and everyone else refuses to take sides. She professes to be innocent in all of this and he is avoiding me. How do I deal with this?

How do I handle my friend gloating that she got with my ex?
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