My ex boyfriend ruined my life....what should I do?

JapanTomboy
So I dated this guy for over a year. He was abusive, cheating and doing drugs and no matter what I did I couldn't get out of it. My current boyfriend helped me leave him and we thought it was the end of it. But ever since he came back to school (he was expelled but they overturned the ruling), he's made my life complete Hell. He got a new girlfriend who is only 13 or 14 years old (he's 18) and is my EXACT replica; because she entered the picture all my friends ditched me! They don't invite me to parties or "Girls Night" anymore, they're always uninterested in what I have to say, when we DO hang out they talk nonstop about her and him...and he spread a rumor that I was cheating on him with the school flirt/my boyfriend's friend as well as other guys so kids at school are calling me a slut, a bitch and everything in between. It won't stop! We tried talking to teachers/staff and even the police once but they all claimed I was lying out of anger of "him dumping me", What should I do? Can I do anything to him in legal terms?
My ex boyfriend ruined my life....what should I do?
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