you aren't the author of his anything.....HE IS.
you are not responsible for his feelings....HE IS.
his sadness, his recognition that it's done, and that he indeed played a major part....he gets to own that.
LET HIM. let him be happy or sad, better or not, sober and suffering or drinking and miserable. he was a drunk, he was abusive. those are facts.
it's also entirely possible that while uncomfortable, part of you liked his contrite come back to me behavior. now that he seems to maybe have accepted it's over, he's no longer making those overtures....and possibly you miss that.