Is this the future you want?
I am 100% on the page that you simply let your wife know that her affair and the reluctance to block OM has completely 100% blown your ability to trust her. It’s not that you don’t want to trust her, but you simply can’t.
In some ways it’s like a fear of getting shocked when working with electronics. Like if you were adding outlets to your house and you only had basic DIY skills you should have a reasonable and logical fear of the wires you are dealing with. Even if your partner tells you they took the power off at the mains, it takes some time before handling exposed wires with comfort. Heck... professional electricians would probably do regular checks and still try to avoid exposed wires.
It’s the same with you. Even if the affair is over – because your wife/assistant says so/took the mains out – you are fearful. Even if the affair IS over /mains really out.
What is needed is some time before you have tested and verified the wires, socket after socket, are not live. The time that is needed, business trip after business trip, clean e-mails, accountability... before you get some trust-but-verify level trust for her.
This isn’t what you want. But it is the best you can offer after her affair.
So... I would simply let her know of your fear and your need for assurance. The fear when she is traveling, the fear when she is at work, at home... the constant fear. You recognize its not sustainable for the relationship but as-is then you can’t control it. Let her know that she can help you establish trust through accountability. If she can offer that then with time your will have less reason to distrust – and thereby build up trust.
Make it also VERY clear that each and every time there is a relapse – as in her responding to contact, searching for OM online, not letting you know of attempted contact... it erodes your will and belief that there is anything to save, and you don’t know if you have it in you to once again go through a d-day.
Make it also very clear to her that she CAN have OM or any other man she wants. You aren’t going to hold her back. But to do so she needs to let you know that this need or desire surpasses her need to be married to you. You would much more want to go through an amicable divorce now or in the next six months, rather than have to go through the pain of discovering a relapse in infidelity.
Btw- the comparison to the outlets? That’s because I’m changing some myself as an overconfident DIY. I test and verify each wire before starting on an outlet, and again if I walk away for more than a couple of minutes. Trust but verify...