Hi there Gregsgirl. I am glad to hear that he is still not drinking. Yes, that is a good start.
What has he done that is so wonderful that makes you feel like you 'can't turn your back on him now'?
You ask "am I being completely blind"? Well, no one can answer that for you. What does you mom say about this guy? She sounds like a pretty valuable source of information. It sounds like your intuition is trying to tell you something about this guy, and maybe you don't want to listen.
Do you think him being mean to you is an acceptable behavior and that you'd like to stick around? What does your mom say about him treating you this way?