Hi, itm, He may be having a mid life crisis. They do tend to say and do just what he is doing. You still have time, it can't be done overnight. If you've never read about or seen a man in MLC, you may not be able to see it. Now you have the book, read that part. No matter what he says or does, it is not your fault. Yes, you have played a part in this M, but the drinking is a flaw in him, not you. MLC makes them say unbelievably cruel things to those they once claimed to love. If you remember to believe none of what they say, I'm not sure how the rest goes, but I just didn't believe anything coming from my alien. One day when he comes out of the MLC, he may not even remember what cruel things he said to you.
You have to detach from him and his issues, don't contact him, unless it's regarding your child. Don't answer every call or text he makes to you. Get out and have some fun with friends and family. Let him wonder. You do what you need to make you feel better.
Read other post here to find similarities to your situation; believe me there are some.