My ex is spreading rumors about me and telling this new guy not to talk to me. what can I do about this?

This guy I used to talk to and hooked up with at my school is now talking crap about me to everyone on campus. I was starting to talk to another guy on his team and he told this new guy not to talk to me because I'm crazy, etc. I've heard from numerous people that he has been talking bad about me to them. Like he is trying to get everyone to dislike me. He told people I accused him of raping me, which is just not true. We didn't even have sex. What can I do if anything about this situation? Especially since now he is saying stuff about me to this new guy I like
My ex is spreading rumors about me and telling this new guy not to talk to me. what can I do about this?
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