I only know about your r/s with G. as much as you wrote in this tread, but I do know one thing: if you find it difficult to say something and wait for the "right time", that time usually doesn't come. What I would do is, I'd tell him at the first chance I get. You explained all the reasons why this would be a good thing and most likely not a problem for him, so keep that in mind and tell him as soon as possible. Not because you owed him anything or because you "have to" - but because you'll feel better afterwards. (At least I know I would, regardless of the outcome.)