Commitment phobic? or just insensitive boyfriend?

My boyfriend of one year 1/2 broke-up last weekend. Things had been off and on with us for most of our relationship. He stopped drinking about 8 months after we were together and things improved 110%, and I thought that was the majority of the problem since things got so much better after he stopped. But I caught him sending a flirtatious email to a woman and a pic of himself 2 months ago to a woman he met while visinting his family 3000 miles away. He apologized profusely, said it was a joke, that she was just a friend. He then told me he didn't want to lose me, wants me to move in with him, that he truly loves me. I tenatively started seeing him again, only to see another email and naked pic sent to this woman last weekend. I broke-up with him. This time he was angry and said I was crazy. Haven't heard from him since and saw he was back on the personals. I truly think he has committment issues. I know I have my faults, but I don't think this is me... I think it's him..