Hi, ding dangler, and welcome to Psych Central! The first thing that came to my mind as I read your post is that people aren't thinking with all their brains when they are heavy into drink. It sounds like that was the state both of you were often in, and I gather more you than she, when most of these hook-ups occurred.

It doesn't sound like there was much communication or any mutual verbal agreement about future plans or especially about being exclusive. So, I don't think it's really surprising that she was seeing other people. It was a "let's get together and have fun sometimes......"

You have already apologized to her about the night of "rough" sex. So, I see no need to go through that again.

I suggest you move on and learn some lessons. What? Maybe not to drink so much when you care about a relationship?? You will need to sort it out, although maybe other folks here have other ideas.

Also, I suggest you think about what you want from relationships in your life. Are you about ready to meet the right gal and settle down? Be in a committed relationship? I think I am picking up on that. If so, then (and I am a mom of adult sons, so I am biased) I think it would be good to be careful about the girls you date. Is the gal more a party gal, wanting to have a good time? Love 'em and leave 'em?

Okay, let's see if other folks will have something to say. You sound like a very caring man.