Hi Hurting and WELCOME to SR.
I'm glad you found this place. There's lots of support to be had here.
First off, it seems like you already know instinctively what to do about this situation: get the heck away from him. You realize already the 3 C's of addiction:
You didn't CAUSE it.
You can't CURE it.
You can't CONTROL it.
The only power you have in this situation is over YOURSELF. You can choose to walk away from this, go No Contact (as in, no calls, emails, texts, surprise visits, Facebook, My Space, LinkedIn, *nothing*), and focus on yourself.
Have you considered going to Al-Anon or counselling? It can be eye-opening to realize that many others have walked the path you're on. And slowly you'll get yourself back again.
I know how difficult this must be. Keep posting and reading. SR is here for you.