A couple of thoughts and questions.
Given the double betrayal aspect, it occurs to me that the OBW might have also been a social friend of you and your WW. Given the proximity, it might also be the case that the OBW encounters your WW on a semi-regular basis. I'm curious if there has been any process of attempting to make amends by your WW toward the OBW, and/or if there has been any talk between you and your WW about tension between those two caused by your WW.
On another point, you mentioned earlier in this thread that your WW had been initiating sex, but you had begun to experience difficulties performing due to mind movies, so she stopped trying to initiate.
Is that still the state of things? How long has it been since the two of you had sex? It is my belief that marital sex is one litmus test for whether R can succeed, or not. I realize it's not the same for everybody, but I think in most cases it's not realistic to think that it is possible to R a sexless marriage, especially where the sexlessness arises in the aftermath of an A.
To that end, what is the truth process about in terms of final destination? One possible outcome is that you ferret out a withheld "dealbreaker" fact. Is it your intention to pursue D if, for example, there was a second instance of PIV sex? What if you learn there was only one instance of PIV sex, but she was giving him BJ's regularly for a period of time before the sex? What if you learn these things via her disclosure timeline, as opposed to a parking lot confession at the location for the poly?
What if she cannot complete the poly due to anxiety? Every time you get it scheduled, either a day or so before, or on the way there, she freaks out and needs hospitalization? What will you do then?
What if you get all the way through this and don't learn anything new? Frankly, if I was a betting man, I'd bet on this outcome, based on what you've told me. Actually, I'd bet first that she won't be able to complete a poly, but assuming you get past that, I'd bet that there won't be any major new revelation.
What if, after the dust settles, the timeline is exactly as she has described -- a period of increased flirting, usually in the context of drinking wine, leading to stolen intimate moments, increasing in frequency and intentionality, surreptitious kissing morphing to fondling, etc., and then, finally, when you were out of town, one instance of actual sex. Will you be left exactly where you were when this thread began?
What will you do about the cuts and wounds of her awful behavior towards you, rubbed raw by the salt in the wound caused by the A. When you desccribed the good things about her, you described things she has done and is doing to be a good wife to you. What I have not seen from you is any description of what she has done by way of sustained, consistent, heartfelt effort to heal the wounds she inflicted.
To that end, in most of the threads here on SI where R is truly successful, one major element is the WW being willing and open to talking endlessly with the BH about the sexual and other details of the A, over and over and over again, ad nauseum, until he is finally able to wrap his mind and heart around them and accept them as a presence in his consciousness. As I read your thread, this is the one thing that your WW has specifically refused to do. In fact, she has demeaned and insulted you when you tried to do this.
As stated above, when I re-read your list set out a few pages up outlining the positive things she has done, what I take away is that she has made some considerable effort to be nice to you and have a "good relationship" going forward. What I don't see in what you have described is any work by her to actually help heal the wounds she has caused. Indeed, it sounds like she would prefer not to acknowledge them, to rug-sweep them. For example, has she ever taken ownership of the deep gaslighting she did to you? Besides telling you that you have an immature view of sex, I mean.
So, again, back to your initial post. I think that's your future. A woman who is trying, for the time being, to be a good wife. You have no way of knowing how long that will last. My gut says that if you stay together, at some point she will become complacent, she will assume/presume the A is "behind" you two, and she will take her foot off the gas. You'll be back to the marriage you had in 2015/2016. Not the marriage you had first quarter 2019.
I'm mindful of what you said about your conversation with your MIL:
I immediately called my MIL who was cold and distant and began talking to me about how bad my marriage was.
I'm also mindful of your recent comment about how it seems your WW says and does things to make it seem like she's both feet in, but her true feelings are lurking just below the surface, manifesting themselves in comments like "I'm sorry for my contribution to the state of our marriage." My gut is telling me that she has long believed that you have a bad marriage, and that you are at least partly to blame even for her A. It seems that this is a fungus that thrives in the dynamic she has with her mother. Maybe her mother is the root of it, though that doesn't matter.
What matters is that, at least from what I read in your posts, it doesn't seem that your WW is prepared or equipped for a marriage in which the A will be a permanent companion to the two of you. From what we see here, true R works best where the WS and the BS accept the A as a permanent companion, talk about it whenever they want, as much as they want, and learn to make peace with it. R does not work by ignoring it and wishing it were not there.
This is why I keep asking you to imagine yourself looking at your reflection in the mirror on Christmas morning, 2029.
[This message edited by Butforthegrace at 1:04 PM, November 9th (Saturday)]