You are struggling b/c today you are not in a good mood. You are a very up & down kind of guy, and making decisions when you are in one of these down/angry moods could be dangerous. It is not sadness you express. It is pure anger! How dare her cheat on you and get by with it. She should be punished. OM should be punished. If you can't have a happy family, why should anyone else? Right?
I have not said much about your own A. But this is the most hypocritical thing I have seen! If you expose her, you better be ready to expose yourself. You need to expose your OW to her H and her children.......and her workplace, etc. Are you ready to do that?
And about exposing to the workplace? If you want to make yourself look foolish.....go ahead. The only reason to even bring the employer into it would be if they were actually scr@wing around at the place of business, or if the company was paying for their trips, rooms, dinners, etc. Othewise, who cares what their employees do in their private lives? (Sad, but it is rare to see disciplinary action taken on the grounds of adultery. Even the divorce courts don't care.)
Perhaps it has worked in a few cases. It would not have worked to save my M if my H had exposed me. It would have been the shove that sent me from my home, family, and town. I would have made some seriously bad decisions out of the exposure.
There are a few exceptions where I feel exposure would be merited, but I would not consider your stitch to be one of them. It won't save your M.
The only time you need to act on your decisions is the days you are feeling really good, like yesterday. Certainly not the days your anger is leading your thoughts.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!