Hi you care because you maybe still love him or you love the idea, you became his carer . You remember how nice he could be how nice he could be to you. I too was in your situation and even after I left him I used to go back to check he was ok which half the time he wasn't. This went on for a few years then he lost every thing and had to move 400 miles away to his parents he had hit rock bottom. After all he had done I still cared .