Aw I'm sorry, that's a heartbreaking situation.
I sincerely hope he stays clean and sober, but you might want to consider what you will do to take care of yourself (and any children?) if he continues to struggle.
It doesn't mean he doesn't love you, it's just the chemicals hijacking his brain. I'm sure he is in terrible pain about it, and sometimes it becomes a vicious cycle, drinking/using more to cope with the pain of having relapsed, insane as this sounds.
In any case, if it were my partner, I wouldn't abandon her or run away, but I would certainly set boundaries and try not to enable. Taking control of the finances if you can is probably wise.
Personally I wouldn't attend al-anon myself bec the 12 steps and I don't agree, but that does help some people. If you can afford it or have insurance, a few sessions with a professional therapist or counselor could help you formulate some plans and boundaries.
Good luck and best wishes.