Forgive & forget?

Here is the low down; I was once in a relationship which i thought could have possibly been the best thing to have happened to me. I started talking to him on the net because he was too shy to talk at school and we would tell our deepest problems to each other. This is how we became quite close as we were both a shoulder to lean on. I knew that he was a bit sensitive to start off with and i wasnt suprised that he would get a bit clingy. But soon our relationship became complicated as he started to become too protective and nosey & seemed as though he just wanted to start arguments. I had read a few of his msgs from other girls in his year which i myself questioned as they seemed a bit suss and eventually he admitted to messaging one of them asking if they would have with him. So after that situation and many arguments and embarring moments in front of my friends i broke it off. He became obsessive & 'stalkerish' until it took my brothers, theyre mates & my own to tell him 2 back