I think I agree with your reasoning, and your plan. For some people, it might not be the right course, you have to be strong enough to tell him without letting him put the blame back on you. And I think you are. If you are not, then I think you don't tell him. You want to tell him because you want to help him, but you can't do it (at this point) if you put yourself at risk. Unfortunately, you have to be selfish about that. But, like I said, I think you can do it.
