Relationships/Dating Advice! HELP!!?

Okay, so hopefully you care i have been dating this guy for 2 yrs. && he's cheated on me a bunch of times through out the years & i know the smart thing to do would be just leave but my ladies know once we get attached its a different subject. We got into a big fight last night because he got a phone call & told whoever it was (mom he says) that he was "at his friends house" hmm. we ended up breaking up he tried to flip it around on me & ended up just dumping me. but when we break up its not for long i always end up taking him right back.. Ladies Or gents what would you do? how would you go about it? && if letting go is the answer are there any pointers you can give to make it easier. THANX A BUNCH I APPRECIATE IT!!