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....

puñetazo, ponche him in the face and run >,...,<

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

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

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

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

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