Well, I think you've come to the right place...most of us here have gone through what you're going through, at least enough to understand where you are coming from.
The answer is simple; just let go, let him be. Building up the self-discipline to put this answer into action, to act in our own interest, is not that simple, especially when we have to relearn unhealthy thought patterns and attachments. It can be done though, and it sounds like you're making the first steps.