Can someone please advise me what on earth to do?

Okay the Ex is at it again.

He is saying false stuff about me all over facebook! He is threatening me and texting me hundreds of times an hour. It is really getting to me now. I am so ready to move on and meet someone that will won't treat me like crap like he did. I just want to get out there and live but he is making this impossible for me!

He is claiming I am on drugs! That is just because every time we have broken up in the past he has gone bang off his head on anything he can find. But not once did I broadcast it across the Internet. I know I kind of am now but this is different I am not mentioning names.

I feel like I am going to have a breakdown or something.

I don't know what to do next I am trying to be nice and civil. I know I am the one that did the dumping so therefore he is obviously more hurt than me that is why I am trying to be nice to him. But he is calling me all the names under the sun and sending me all sorts of abuse. I don't know what to do??????????