We have all been there. Whatever happens is not your responsibility, and everyone that wants to get clean and sober has to do it for themselves. It's great to be supportive, but be supportive maybe when he's gotten help and been clean and sober for a while? I've fallen into that same trap of feeling like you're the only one there for them, but it doesn't mean that others haven't tried to be there for him just as you're doing. My AH has a family that aided in substance abuse, because they all use, and it lead to painful horrible experiences, but there's only so much you can do. Being there like you are does possibly set you up for manipulation, and just because you feel strong enough emotionally, doesn't mean you always will, and it might be harder to walk away at that point. Please just take care of yourself, and give him time to do the work for himself and then revisit being his support.