#1: Tell him. It'll be a lot easier than carrying it longer and then having to 'get caught" or have to fess up.Come on, you can do it. Present your case.
#2. Yes, I have an addiction. So the only thing I can do is just not go in there. When I go in for thread, etc. I really have to do some talking to myself to be sure that I come out with only what I go in to buy. (Although I do weaken sometimes, but I'm getting better.) I try to remember all the pieces that I bought and still have in bags or in drawers or in bins, or in closets...you get my drift.