I'm sorry you are here. My story, at least the beginning (I'm further out than you are) is similar to yours. I will give you the background before I address your question, so feel free to scroll to the end if you don't need it.
My WH had an A with a co-worker as well. They still work together, but (allegedly) are no longer engaging in the A. We still live together, but are no longer engaging in R. I will preface this by saying that the A lasted about 2.5 years. I caught him after it had been going on for about 5 months. It started as her talking to him about her H, the OBS (who also works with them and who was one of my WH's best friends - he was in THEIR wedding), and 2 weeks it accelerated to sex. Much like your situation, most of it occurred at work, but they did bring it home a few times, especially in the beginning when I was temporarily out of state for work, so it was easier to pull off. They talked daily and literally sent 1000s of messages to each other every month - AND talked at work as they worked together almost every day - so basically, for 8 hours every day, they were in constant communication in one way or another. Seeing as we all have to sleep, and I have a job, I would argue that during that time they spoke to each other far more than my WH and I did, even though we lived in the same house.
At d-day1, he called it off, but that only lasted a few weeks and it was back on. Apparently it was off and on for the next year, mostly on, but one of them (usually him) ended it and then went back. I caught him the 2nd time almost a year to the day after the first time, and again he claimed he wanted to R. After d-day1 I did not tell the OBS (complicated reasons relating to their work) but after d-day2 I did.
After d-day2 he went NC for 3 months and she messaged him periodically, telling him she loved him and missed him or hated him for "ruining her life" - basically every manipulative tool in the shed was used to bring him back. I have no doubt he at least thought about doing the same during that time...and eventually, after 3 months "it" worked (I say it as I have no idea if it was her reaching out to him that started it back or if he reached out to her - I don't care anymore about that either) and they started back up again, the whole time he was telling me he was going to "prove" to me that he wanted to R, which was bullshit. What he wanted was to go back to their secret affair and have me at home.
At the end of the NC period following d-day2 (I actually think these events led to the re-start of their A) the OW messaged me, pissed off that she had been sneaking looks at her H's phone and saw some of the messages I sent him. There is a thread a few years back detailing the messages she sent me as they were so outlandish. Message 1 told me her H knew everything I told him (he didn't - at all). Message 2 told me that I was not his "friend" and I needed to back off. Message 3 "reminded" me she and her H had a child and that it was highly insensitive of me to "ruin" their child's life by talking to the OBS about this. Message 4 was angry at me and said she was "tired of this bullshit infiltrating her life" - so yeah, no remorse, or guilt, or anything - in fact, the opposite. I did not respond to any of them.
The fact that those events, her reaching out to me, and me deciding to share this with my WH, which led to him contacting her because he was "pissed" which somehow led to them sexting and right back to square 1, his alleged "defense" of me long forgotten (NOT blaming myself at all - they are POS of the highest order) - yeah, I TOTALLY UNDERSTAND how you feel. I have since had 2 other communications with the AP - one she instigated, and another long, rambling email which I sent to her a few weeks after d-day3, the OBS and my WH, which was a vent FOR ME, telling my WH and the AP what pieces of shit they were, calling them out for a whole bunch of stuff they had done, attaching screenshots of texts and some other stuff so what I said could not be contested. The AP messaged me a few days later in a thinly veiled attempt to find out why I chose to write the email at that time and to be sure I didn't have any other info. My words were short, and choice, and gave her nothing. I haven't heard from her since, but as she and my WH still work together (although due to COVID they have not in about 4 months), she is still around. I am in IHC with my WH, and I will be leaving when my job ends this fall.
But your question was: what do you do with all of this hurt and anger and sadness and fucking misery and worry and stress that has been hurled at your doorstep? You will hate this answer, as much as I did when it was said to me...
The short answer is time, and clarity of thought, and making yourself Plan A.
You assess your options, realizing that you can and may change your mind at any time, and you prepare for the "worst" whatever that might be. If you have financial issues, look at your situation and start working on an exit strategy - not because you have decided to take it - but precisely because you have not. You go to counseling or find a friend(s) to talk to or ideally both. You find things to occupy your time. You try to give yourself some space between you and your WH, not to "punish him" but for you. You allow yourself to grieve, and you wait if you need to, to find some clarity. Set yourself some time limits - as in "I will think about things, look at my situation and what I need to be better prepared if I choose to leave, and look at my situation and determine what I need if I decide to stay and I will revisit this DECISION in _____weeks/months" and don't decide to do either 100% until then. I rushed a decision the first time - I didn't the second - I watched and waited and prepared, and now that unfortunately my WH showed his true colors I AM prepared and am able to leave in a much better position than I was in 2 years ago (ugh, I know - 2 years).
If your WH won't change jobs while I am not going to say he WILL go back to it (as there are no absolutes in life but death itself) it WILL be harder for you to deal with and the chances of it starting back up are much much higher.
As you can tell I could go on and on...I'm sorry you are here. You have no idea how much so. Unfortunately there are no easy answers.
[This message edited by ThisIsSoLonely at 10:32 AM, July 16th (Thursday)]