Hello and welcome.
I think addicts act out and are more critical as we become more healthy and change our own reactions. Always looking for a way to put the focus on the other person instead of accepting they have a problem. Most of us here have went through that crazy time of trying to control the situation and the other person, until we realize, you can't!!!! The Three C's are:
You cannot CONTROL it, you cannot CURE it, and most importantly, you DID NOT CAUSE IT!!!!
If he is still drinking heavily, that does not sound stable for you or your kids. To answer your question yes, there can be change. However, they have to work recovery and want that every single day, for the rest of their lives. It's a big commitment that not many are willing to make.
Keep posting, you are not alone.