And you don't WARN him you are going to expose, you write the exposure script, post here for some input, then DO IT.
HE will be angry, OW will be angry... I assume she's not married? If she IS then you expose to her husband as well. Try to get as much contact info on the OW's husband if she's married.
Let him be angry that you exposed.. locking the liquor cabinet pisses off an alcoholic too, but its for their benefit as much as yours... that crap aint' healthy.
more to come... Try to fill us in on some of the details of whom you have exposed to and the results in a signature... no signature right now. :|