I was in a relationship that ended the same way, and I think that if he is truely remorseful and he comes back basically begging and pleading on his knees you should take him back, but if he has moved on with another girl then he is just an ***** and you should do everything in your power to make his life h#**. I don't like to see the women i love in pain, but it seems like your ex is the complete opposite. my suggestion is to make him suffer like he made you suffer. Get creative...