My boyfriend cheated and I cant get over him....?

My boyfriend and I have been together for six months now the first month we were together he cheated on me and I got over it, same thing happend the second month but he had an excuse which I still do not believe and I tried letting go of that one as well. Ever since the first time though I have been nothing but suspicious about everything he does and it is just too stressful. All the texting and the IM-ing I just wanted to know what he might still be doing behind my back. Yesturday we got in a big fight and he ended up admitting to cheating on me with at least 4-5 different girls. He told me this in text messages. Said that he ruins every relationship he gets into by having with girls who mean nothing and failing to stay faithful the the one he loves and that he does it because they are his safety net to fall into because sooner or later he would eff the relationship up. He said that he needs some type of help and cant admit it to himself, he feels ugly and likes when people tell him hes not and that screwing other girls makes him feel loved, I have always expressed that I thought he was good looking and I loved him with all my heart. The truth is that I knew all that all along I knew a lot more than he thought I knew because I secretly read his text messages and IMs and I stayed with him anyway I thought that eventually he would realize that I was in it for the long run and that I would provide all the love he would need and he would change his ways. I am even still with him though he cheated on me just a few days ago, I just can't seem to get over him. I have been living with him and his family and they have become like my family and I love them to death but they don't know the pain he has put me through.. I know you all will think I am stupid but go ahead and tell me what you think of this messed up situation.