Friend or Foe?

I got an email today from Eharmony boy. I knew it was coming. The gist was "I'm truly sorry for what happened and I would like to know if we could be friends". I know I need to respond, but I'm not really sure where I'm at with all this. I have no hard feelings at all regarding him. He did handle the situation (for the most part) like a man and was up front with me. He is definitely someone I could see myself being good friends with. However, I have a LONG history with men leaving me for other women and/or cheating. Each time it happens my self esteem shreds more and more. I'm afraid every time I talked to him or hung out I would be reminded that I was great, but just not great enough to get the guy. I don't need a friendship that's drama or complex. I think I'm going to email him back and tell him that I'm not upset or angry with him, but that I need a bit more time before I can be friends. Sigh. I truly wish I knew why this situation keeps happening to me. I'm so tired of being the girl men kill time with while they hunt for a "real" girlfriend. I've had airport layovers that lasted longer than most of my relationships. I need a guy who's looking for some frequent flyer miles.