If you confirm that your W is having an A with her boss, do you think it is fair to the OM's wife to keep it quiet?
One of biggest things an A thrives on is the secrecy. Exposing it can shorten the term of the A considerably. I know that it worked in the case for Puppy Dog Tails who helps out newcomers. Of course if you expose your W's A, she will be majorly pissed, but do you want to live in fear?
Even without confirming, it seems you are living in fear which is somewhat understandable since the bomb was only back in Sept. Take your time in making any decisions and try to run them by here before you do. Use the 48 hour rule when you decide on something because after 2 days your feelings may change.