I read your post, doesn't sound like a fun situation to be in, my X husband was an alcoholic so I can relate to that portion of what you are going through...and my current H is LD...but a wonderful man.
I absolutely agree with Jenny on the weight issue, no question about that. I have a question for you though. Ok, you're not legally married to this man, you knew he was an alcoholic to begin with (and still is), and you say you've never been in love (these are all things you stated in your post)....this is going to be blunt but it's the only way I can ask this question......why are you still there? What is the benefit in staying? What's motivating you to stay? Ok that's three questions, but something to think about. Try answering them honestly for yourself, it's a place to start determining what to do.....one way or another.