It is his program let him work it. Don't over think it and concern yourself with his issues.Get into Alanon and find a home mtg to attend on a reg. basis (if you haven't already) My son is an addict. I started alanon 4 yrs. ago and it has literally changed my life. At 1st since I have no addiction issues I couln't relate to the steps. But once I started applying the principles all my relationships are better, my communication is better and I am on spiritual journey now. This is a family disease and it is easy to shine the light on the addict. But we all have our own issues and character defects and we can only control how we are gonna change in those areas.
The best way to help him is to help yourself. Good luck in your journey.