Advice, please?

Take him back, but this time, be really clingy, bratty and everything he hates. That should make him back off.

... do the only sensible thing....

punch him in the face and run >,...,<

Hm sorry for asking this but why do you hate him you should at least give him a chance:)

Ahhhhh the old 'i love you I love you not' I've sort of been there just tell him you hate him and that you really mean it don't threat or anything but yeah tell him that you two are just not meant to be togather and that you don't wanna ever be togather with him ever again and if he still comes at you say something similar to what you did but make sure you say it in a calm serious firm tonewhere if you just yell at him he'll just think your joking or something

Well, obviously, this guy is a biscuit. To deal with biscuits, you need to just ignore the living crap outta him. he will leave you alone.

Tell him that you'll never get back together with him. If he asks why,tell him that you don't want a boy who cheats on you and calls you a slut. Get him out of your life.

Tell him that you hate him and if he doesn't leave you alone you'll drop a heavy metal piano on his head.