OH god, I can just feel the pit of my stomach fall out in sympathy, AC. Been there, done that. My advice? Talk to him about it. It may not be as bad as you imagine. It may. You're not going to know until you confront him with your discovery, and its just going to make you miserable in the interim. Everything that he says is going to appear suspect until you lay it all out and get it off your chest.

Nat