I think you already see the handwriting on the wall, honestly. You sound very smart & aware.
I'm never "that" poster here on the board, but today I will be:
Run. Run far & wide & get out of this relationship at your very first opportunity. Leave before you are tempted to consider having children with someone like this. It will not be easy, and it will get harder as time goes on.
Alcoholism is a progressive disease and what you are seeing right now is the VERY BEST it will EVER BE until or unless he chooses to get sober for himself. Not for you, not because he's forced to, not for any reason except that he is ready & willing to take the steps to lead a sober life.
Judging from your description, I would guess he's miles from making this leap of faith, but that doesn't mean that you have to be dragged down with him until (or if ever) he does.
I know that's not what you are here asking in your title and I'm sorry if it comes off harsh... it is literally my first reaction to reading your post.