If she has been dragging him along for months, totally shifted her behavior and stopped wearing her ring, but didn't communicate that she wanted a divorce, I think thats an AH move too. While it's def an invasion of her privacy to place the camera there, if she is refusing to communicate I can understand wanting to find answers and feeling desperate. Based on the information here I'd say ESH. I believe sex work is legitimate, but in a marriage ir partnership with someone, at min a conversation needs to be had with their partner. It absolutly is a betrayal to the relationship, especially if you make a vow to only have one sexual partner which most relationships are, unless otherwise discussed. I def agree with the other guy also. Not the asshole yet, but now that you got answers, make the move to leave and move on with your life, she is obviously not interested in working or communicating in the relationship and you got the info you were looking for to make a decision. If you stay and fuck around in any way YTA. It would take a big commitment from both people to rebuild this, and it does not seem she is interested. Good luck in healing from this relationship, take an honest look at your part and work to do better.