Hello Maison, I don't post much, I mainly lurk, but I wanted to give you some ideas about your situation that might be useful (I hope). It sounds like you're being amazingly strong about putting together your evidence for divorce - which is what I hope your conclusion is. Divorce should be at the end of most affairs as most of them seem to do it again, and we never really get over it anyway. Most of us don't, even many years later, but I'm concerned about how your planning your confrontation and I wanted to give you some ideas.
Be prepared for any kind of reaction here, you may have one that seems typical of her that you expect, but that may not happen. You have to be prepared for all kinds of reactions. It could go down like this:
1. She says nothing, maybe walks out
2. She admits it and says, so what, or I love him, or I want a divorce, or I've dropped it.
3. She denies it entirely, says you're wrong, you're misinterpreting things, she gaslights you.
4. She gets angry and starts fighting back, verbally or physically.
5. She gets hysterical, starts weeping, begging, on her knees, swearing on the kids' heads, etc. She'll end it, etc.
6. She says she loves you but not in love and wants a divorce.
7. She accuses you of stuff, blames you, maybe she even accuses you of attacking her, or she's "afraid" of you. (I know someone that happened to and no he never did anything to her.)
Or some combination of these or other things. She might react like she did the first time you busted her, or she may react different. My point is you have to consider all kinds of things and be prepared. You need to move forward and you need to protect yourself. I would have at minimum voice activated recorders on you and just tell her you're recording the whole thing for accuracy and both of your safety. I'd also check with your lawyer about recording. I'd tell her you were recording anyway, and maybe record it visually too with a camera placed somewhere, but check with your lawyer about what's legal. BUT DO RECORD THE CONFRONTATION because you'll want to remember this and you need to protect yourself from her legally. She's an excellent liar - one of the main reasons recon doesn't work because....when can you believe her.
You might also run these scenarios through in your head or maybe if there is someone you can absolutely trust who will not tell her, maybe play them out in some safe place she won't see or hear. I think she's probably got some idea in the back of her mind that something's up because she's asking you about YOU cheating....that's her frame of reference....but it must seem to her that something's a bit off. Not enough for her to stop her own behavior, but enough to be a bit wary of you. Running through scenarios with someone you really trust who'll keep their mouth shut may help you get through this.
Also, be sure that you keep anything you do well hidden from her and very secure. Your phone (maybe use a burner phone at this point to talk to your lawyer, etc), evidence, computer - whatever....try to be very secure about what you've got and don't let her see anything. You do have to try to behave as normally as you can with her, except for sex, of course, but you're doing an amazing job. Keep your eyes on the prize.
Lastly, talk to your lawyer about what happens after confrontation. Who leaves the house, who stays, in house separation (which I don't advise if you can avoid it - talk about stress!). You want to know what your rights are immediately after and going forward. You don't want to be seen as "abandoning the house" but you also don't want to be forced out. Be sure you know how to handle the aftermath of the confrontation. Who's gonna live where, how do you both deal with belongings, who do you tell, and what do you say to the kids.
I'm so sorry you're going through this, but you're doing an amazing job - I'd just focus some more on the confrontation - it will help reassure you to be able to handle all kinds of scenarios and it will give you the best outcome. DO REMEMBER TO RECORD IT ALL THOUGH because you want to have proof of what was said/done on both sides. Going forward you should record ALL your interactions with her, both for documentation and protection. As I say, I have seen it before with a good guy being accused by his WW of her being "afraid" of him, etc, and he never did anything to her - but she did steal hundreds of thousands of dollars from him on top of cheating. They didn't divorce, I guess he doesn't want to split up the property which is considerable, but she's living in another state now and I guess what she stole is what he thinks the settlement is. BUT DO RECORD AND DOCUMENT EVERYTHING. And don't let her intimidate or blame you - you're in the right here. GOOD LUCK!