heres2hope,
I know how you feel. Whenever my A "sneaks" drinks I always want to call him out on it. Usually he's drunk and isn't so sneaky anymore, as he's usually swaying or passed out. But for some reason I have this urge to point it out to him. If anything to show him that he didn't trick me, I know he was drinking, and it's not okay.
Can't really offer any advice, but I know how you feel. Some days we are stronger than others.