I was pretty much aware something was going on for the better part of the affair and tried to talk to him about it many times over the years. With no success, so about three years ago, I sort of gave up on our relationship. I believed whatever they had was over at the time
May I ask if you knew/suspected this specific AP or was it a generalized, amorphous feeling of something wrong?
If you had specific points to bring up to him all this time, what was so different about seeing him talking/texting on a new phone?
I'm trying to figure out if he had had enough of her, if it was fizzling out, if she was making demands, or what.
You see I am married to a serial cheat who takes breaks, sure, but never really went NC with any of them. The most serious threats to the M were two COWs and a SIL. He would rather die by fire than have people think he was not in perfect control of his life, his decisions and me, the lowly wife.
I don't like checking on him. He doesn't mind, he says he deserves it
Mine doesn't mind either. I check on him and he loves it. It feeds his ego. He thinks it's the price he has to pay for being so irresistible to women.
...for the physical part. A few out of town conferences (maybe one or two a year and not even that in the last two years) and an occasional afternoon (once a month, rarely twice and nothing physical in the last year and a half).
In a the longer affairs they don't have to meet up very often. If they didn't get physical for a year and a half, then for intents and purposes it must have seemed over to your H. Why the need to confess if it was mostly in the past and why the need to start having sex again after this D Day? This does not seem to add up. Why confess to the 9 year one and not the 5 year one if that's the one that was physically active?
My intent is to encourage you to pursue disclosure to your H's HR department. As unpleasant as it is, I think you have to insist on getting a written report, from HR so you know not only did your H inform his boss, but also HR. The file should be signed by the person that you would be able to call and confirm if need be.
From that you have something to hold over the AP. She's going to have to behave because someone's watching.
Your H should have zero objections since he already informed his boss, he says. I'm not suggesting something huge and scandalous, I'm suggesting something that the company has on file that spells out that these two employees will not be sent out of town for work together and why. They can send AP her own copy to read at her leisure.
I see no reason for your H to object. Esp. since he claims he told his boss.
The NC letter. I don't think it's ever going to happen. If it does, he could go behind your back and square things with her. He ignored her demands not to do certain things with you and maybe that's the kind of guy he is. Why butt heads?
I would pursue the HR thing and hold off on the NC letter.
I would also tell the OBS and please do not warn your H. Never speak of it and just do it. This should be how you let her know about the other 5 year AP. Through her H.
I wonder how fast it will get back to your H and if he takes her side even a little bit. You are going to need the letter from HR in case your H allows AP to convince her BS that you are crazy.
So my best advice is to insist your H go to HR. Get a copy of the report. This will be something on file to protect your H. That it was mutual, is over, no company travel is advised and both parties get a copy. Who could argue with that?
One last thing. The friend who talks to your H and is a friend of AP. Your H has to drop her too. Affairs have consequences. No go-betweens. Your H may be disciplined enough not talk to her about it but make sure she's not making the case for her friend to your H.