Kill him with kindness. When he sees what he’s doing isn’t bothering you, he will eventually leave.
Ignore him. If he says something nasty to you in the hallway or a text, don’t say anything or pretend you don’t hear it.
If he tells someone to tell you something, act like you never heard it.
Totally erase him from your life. When he’s around, act like he isn’t even there. If you totally wanna mess with him, when someone says his name when he’s around say “who?”
Never let it bother you! If he calls you ugly or fat, never believe it! He’s just still upset that you guys broke up. I bet he doesn’t even mean it.
Never try to get even and spread rumors about him. It will just make things worse.
Act like nothing happened between you too. It will drive him nuts.
-wikihow