Do you know that he could change this if he wanted to? I wouldn't feel too sorry for him. He apparently doesn't feel it's enough of a problem to warrant changing for.
It took me a long time to get this through my head. He was fine with his drinking and everything he put us through, the abuse, the destruction, all of it. It can be hard to reconcile that at the beginning when they still sometimes seem remorseful, but that is not genuine regret. It is just one more tool in the alcoholic's arsenal that lets them drink without consequences for a little bit longer.
If he was really sorry, if he really cared about how it affected you and the kids, if he really wanted to stop drinking and change his behavior, he would do it.
My ex was totally fine with drinking and mistreating the family. I was the one who had a problem with it.