Taking a cheater back?

Me and my friend started dating in December. We had a short break up in March and got back to together the last week of March. We have been dating long distance, he comes into town every month or two so it was okay and sustainable. Well exactly a week ago I found out he was dating another girl for over 2 months. As she put it they were in love. I thought my relationship was perfectly fine, me and him never fought and we never had any true conflicts. After surviving the pain and heartbreak of this last week, I've come into contact with him again. He says he has no real reason to why he did it though he is extremely sorry and mournful over the loss of our relationship. He states he still loves me, and even though he has hurt me irredeemably bad. I still love him. The crossroads I am at is a torture to know what to do. I know the normal thing to do would be to tell him to **** off and get over the relationship and move on. But that's not what I want to do. I want to rebuild our relationship and be together again. I believe me and him have potential, though since no one actually knows him like I do it's hard to take in others opinions without bias or trusting them. So yahoo. Give me your best shot. What's your opinions?