I strongly urge you to look into the symptoms of codependency and first tend to yourself, not him. Here’s one list: http://psychcentral.com/lib/symptoms-of-codependency/00011992

Caretaking. Another effect of poor boundaries is that if someone else has a problem, you want to help them to the point that you give up yourself. It’s natural to feel empathy and sympathy for someone, but codependents start putting other people ahead of themselves. In fact, they need to help and might feel rejected if another person doesn’t want help. Moreover, they keep trying to help and fix the other person, even when that person clearly isn’t taking their advice.

Your relationship with this person is a romantic one, not a patient-therapist one. I know that it’s a horrible feeling to see others suffer, but as long as you do not take care of yourself first, you’ll do more harm than good by attempting to solve his problems for him.