Originally Posted by
faithfully 
No, thought about that, no. I tried to leave and the last time he wound up in the hospital. I love and care for him and am sad, but I'd rather he didn't need me in any way other than spending time, like all friends.
It certainly sounds like he's in the midst of decay and belongs in a hospital.
So long as you care and provide for him he has no reason to consider other alternatives.
But you know what, this is not about him. It's about taking care of yourself. I don't even know you but I do know that you deserve to treat yourself better than you have been.