Your post brought back very unpleasant memories for me. It is good to face the fear and to share with others. Personally, I never was able to come to terms with it. I still hate him, even though he is no longer alive. I tried therapy, but it just ripped me apart. My husband, doesn't understand either. He is supportive, like yours, but has no concept of what is was like growing up (being at the mercy of) with an alcoholic parent(s).
I hope you can somehow come to terms with him. Thank you for having the courage to post this.