DM, I would definitely put her post A attitude in the category of cake eating even if she admitted to you after the fact.
She is minimizing. This is not good, this can stop healing dead in it's tracks. Look, you don't want the extreme details. I get it, too much too process, but be careful. IMO there is a difference from "we just kissed" to we had full blown sex, and that was just the tip of the iceberg.
Just by chance OM was honest to her in that letter, I read that and saw a lot of unanswered questions. Now maybe she is underestimating you, that you won't see it; but what does your gut say, not anyone here. How did you feel when reading it? You don't have to say it.
You are still at the beginning of healing, this is like a "raw wound" that has to heal from the inside out. The emotional poison has to leach out.
It is why, what long time posters are trying to warn you. I partly know what they are talking about.
Imagine the year 2020, this whole thing is behind you. You are 4years into R, you hardly think about it now.
An event is going to happen, either she is going to slip up on answering a question or you're going to attending her XMAS party, and someone who knows is going to say something, maybe just out of earshot. You were not suppose to hear it, but everyone is buzzed, and people start to talk louder. It's something that there was more than you knew what was going on.
She just didn't have a PA, this was emotional also. And maybe more than she wants to share.
The truth matters now more than ever. If you find out something, doesn't have to be sexual, it could be personal/emotional level -- 4 years go down the drain.
It's a matter of building trust, which leads to respect, then love to a stable marriage for both of you.
I feel right now you are rushing, trying to take short cuts..."I want this mess behind me, so I(we) can move forward".
Stuff like this: I want to believe her, I don't care about the details, it doesn't matter -- is a form of denial. Make sure you are looking at this with your eyes open, don't delude yourself into feeling better. It will cost you in the long run.
If I had known I could have polygraph my wife back when this happen to me, I would have done it in a heartbeat. No kidding.
I don't care if she confessed, when she did confess it was minimal "kissing, no sex" "we talked nothing happened".
Everyone here in the beginning said bull, she's lying. It's why they are saying this to you now.
Remember she had to lie to you to do the A, why all of sudden, you believe she is tell the ABSOLUTE truth now.
Right now today, matters more than you think. I know. Don't make this major mistake.