My ex-boyfriend calls me a slut and accuses me of cheating

We've been together for about 10 months, we broke up last month but he doesn't seem to stop msgn me. He says things like "you're a slut" "I'm glad we f**ked".

And he also puts pictures of me on his profile.

sometimes he sends me anonymous msgs saying I'm a slut.

What should I do? How do I get him to stop, cause ignoring him isn't working.

Updates:
i didn't cheat, I barely talk to other guys

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