First of all, give yourself more credit! You deserve so much better then the way he treats you. Second, give yourself some respect because HE definitely does not respect you. Third, dump his cheating loser butt! Fourth NEVER LOOK BACK! Good luck.
Take him to a really romantic dinner, outside, with candles. Then, have a conversation about how your last boyfriend cheated on you and you killed him and buried him in the woods. Then point and say, in fact it was those woods behind you. Then, blow out the candle and laugh evilly. (I saw this on tumblr) :P Seriously you should do this.