My recommendation is start with yourself. What do you want? If you don't know, get help figuring it out. It sounds like you'd R if your W would commit to doing the work she needs to do, and you don't want a messy D.
Look inside. Do you really want R? You might not....
Assuming you want R, your W needs to get a job away from om. You need to tell om's BS, as hard as that is to do. She's entitled to know what kind of man her H is. I recommend telling HR. This executive needs to stop preying on or letting himself be preyed upon by employees. (Your W may lose her job, but she might get a decent sexual harassment settlement. The exec should lose his job, but you might lose yours if he doesn't - but HR needs to be told.)
A remorseful WS answers questions honestly, makes her life an open book, keeps you informed of whereabouts/companions/activities at essentially all times, does IC to change from cheater to good partner, does MC as appropriate, raises current M issues (not past resentments, which no one can do anything to fix) so you can resolve them, etc., etc., etc..
It sounds like your W isn't there at this point. I suggest confronting her and giving her requirements for R. If she agrees to meet them, great; if not, well, that's great, too, in a way.
I knew pretty quickly that I wanted my W to love me, to be in love with me, and to agree to be monogamous until one of us dies. She never said ILYBINILWY, but if she had said it, if she didn't think those 3 things were in the cards for her, I wanted out, even though I was 66. You're much younger - don't subject yourself to years and years and years of a W who is not IL with you.
IMO, you need to get down to your real desires - R vs D, requirements ofr R, consequences for not meeting the requirements if you choose R, how to do the D if you choose D, how long you're willing to wait for your W to get off the fence.
This is a crisis in your life. Only you can resolve it.
There are a lot of different voices on SI. It's up to you to decide what advice to follow. I guess Rule 1 of SI is 'adhere to the guidelines.' Rule 2 is, 'Take/adopt what makes sense to you; ignore the rest.'
For the record, I, too, recommend giving your W a choice between your M and D fairly soon, but it's up to you. I, too, think nicing her back won't work.