Thank you to everyone who took the time to offer a response. I've found that thinking about and processing everything seems overwhelming. And yet there are themes in the responses that I think have helped me focus. It's true that this is a club that I never wanted to join, but I'm grateful that all of you are here.
From some of the responses, I realize I need to offer some more detail on my wife's work situation. Within a year of the affair ending my wife was laid off from her job. The AP was no longer her boss at the time so had no role in the layoff. My wife found a better job relatively quickly, and since then has found an even better job and the new company has treated her wonderfully during her sick leave. The AP was laid off a year ago, and has yet to find another job. I presume it's pretty hard to find one now in that industry thanks to COVID. I'm happy with that fate for him. Without letting my wife off the hook for one second, I have a particular dislike for bosses who take advantage of their position, which clearly happened in this case. I am a boss and have had many women working for me over the years. The thought of having relations with any of them, even if both of us were single, repulses me because of the clear misbalanced power dynamic. While both the AP and my wife crossed the infidelity boundary, he alone crossed a separate workplace ethical boundary.
Several people mentioned that I need to tell the OBW. I know this is practically a hard and fast rule on SI. But I've also read many differing opinions outside of SI. In this case, the affair is over and there has been no contact for 2 years (I've investigated call records and email and the evidence backs that up). Also, the OBW used to work in the same industry as her cheating husband. It's a relatively small industry where everybody knows everybody else and if OBW and/or the AP decide to bad mouth my wife it could seriously affect my wife's earning power. And that would affect my kids directly, as well as me in a reconciliation. Not worth the risk. I do believe the OBW has an absolute right to know. I don't believe it is my obligation to tell her. It's the obligation of her cheating husband.
I spent the first week after learning about the affair plotting revenge against the AP. I tracked down his current phone numbers, address, name of wife and kids etc. But after a lot of reading about infidelity and the aftermath I've decided I have no interest in revenge. My issue is with my wife, and I feel I need to spend all my energy on dealing with that, as well as helping her heal from the cancer.
Several others also brought up that HPV passed on from the affair could be a possible source of the cancer. This is likely true. The cancer biopsy for my wife showed "light staining" on the HPV test. Further tests were inconclusive. The doctors have concluded it was likely HPV related but can't say for sure. In all honesty, I hope it is HPV related because that means the chances of the cancer coming back are very slim. Obviously, it sucks for me that I've likely beeen exposed to HPV through no fault of my own. I guess I can take some solace in that my risk profile is the same as 60 or 70 percent of the adult population. In hindsight, I'm amazed it didn't occur to me after the HPV stain test to ask my wife if there had ever been anyone else, but I didn't. As I said, I had total trust. And yes, STD testing is booked for me.
A number of people questioned the timing of her telling me about the affair. A cyncial view is that my wife has used the cancer to simply unload her guilt on me. Believe me, I understand the pull to be cynical now. But truthfully, this makes no sense to me. It seems to me that she has simply traded the guilt she felt for not telling me about the affair, for a new guilt as she sees me in a huge amount of pain that she caused.
I asked my wife why she told me when she did. Her answer was that she felt she was dying. After the excruciating treatment every part of her body hurt, from top to bottom. She became convinced that the cancer had spread with every new sensation of pain. We have since learned from the cancer psychiatrist she's dealing with that this is very common right after cancer treatment ends. My wife says as she resigned herself to the idea that she was going to die she could not shake the thought that if she died I would be mourning her as a wonderful, loving and caring wife - and that she couldn't stand the idea of me mourning an incomplete or wrong picture of her. That I deserved to mourn her knowing everything. She also felt maybe that would make it somewhat less painful for me to mourn her. When she began suffering what looked to me like a full nervous breakdown, she felt she had reached now or never time, that there might not be another opportunity to ever tell me. She told me when she was at the most vulnerable point of her life. I had never seen her so broken. But she said she was willing to accept whatever happened to her as a result, even if it was me dropping her off at her brother's house and saying good luck. I believe her. She was in no state to demand anything from me at that point. And if she was gambling that I wouldn't follow through on what I said I would do that was a risky bet - she knows I tend to follow through on what I say.
MickeyBill2016 asked the following:
Is the affair something that you could forgive if she did not have cancer, if she had the affair ended it and then you found out on the same timetable..?
My ability to forgive is based on two things I think - my love for my wife, and my belief that she loves me, is truly remorseful and is willing to do whatever it takes to help repair what she has broken in me. So yes, if you subtract cancer from the equation, I don't think anything changes in my ability to forgive.
fooled13years asked whether I still feel I could never forgive my wife for infidelity and would divorce her. The thing about when I repeatedly said that I would divorce her is that it's not something I ever thought about seriously. I had total trust in my wife that she had never cheated and never would. I treated these exchanges as part of the regular light hearted banter that we often engaged in and basically just threw out that response almost by rote without thinking very hard about it. I figured I was just stating the obvious - that cheating is bad. It never occured to me that she had already cheated on me. The moment she revealed she had cheated on me, I realized within an instant that the question of what to do is actually way more complicated than I had ever considered, cancer or no cancer.
fooled13years also recommended I don't have an RA. A revenge affair is something I have zero interest in. I'm not willing to compromise on my own morals. Plus now that I know first hand how horribly painful it is to be betrayed, I can't imagine inflicting this pain on anyone, nevermind someone I love.
Bigger suggested I break everything into individual problems:
I see three major projects ahead. Three things for you to focus on.
If you can – then consider addressing what I think might be the most important two.
1) Your WW recovery.
2) Your personal recovery.
3) The infidelity.
I really appreciate this advice. I think so far I've been treating all of this as one giant mess. But you're right, this is exactly how I would deal with a crisis at work - break it down into individual problems and deal with them one by one.
And finally, to Throwaway999. I am so sorry for what you are going through. I feel I'm lucky in the sense I will have the time I need to process everything with my wife. It sounds to me like you may not. I wish you all the best in your struggle. I'm sending good thoughts and vibes your way.