Good on you. The attempt is key, and he may thwart all attempts, and that is ultimately on him. Best of luck.
I was given information I wasn't supposed to have. I have one way of contacting him, other than knocking on the door of where he is currently living. It won't be pretty. I can be pretty blunt at times. I'm not sure that is what he needs.
People with substance abuse problems will steal from their own parents, so don't take it too personally if you aren't treated very well.
I dont want to ruin our friendship. I've known this dude for 20 years (I'm 34). But I'm leaning towards not caring and willingly sacrificing our friendship if I think it will help.
Not caring about how your friendship is impacted by this and caring for your friend is all that really matters.
The fact that you are aware of your possible shortcomings and the associated risks in dealing with such a problem says more about your abilities than you give yourself credit. There are professional resources available who might be able to give you additional guidance if you are so inclined. Wishing you strength and a positive outcome.