Hi Achilles,
I think she is still struggling with what she did and why. I feel like she can't totally come to grips with what she did and how it hurt me. I see she knows she hurt me and hates that, but she hasn't come to an understanding of why yet.
It takes time for some waywards to take ownership of and responsibility for the damage they have inflicted on the people who loved and trusted them. The process is not helped by all the lies they tell themselves to enable their affair, like "He/she wouldn't care if he/she knew", "It doesn't matter, because he/she doesn't know about it", etc, etc.
Your wife admitted that she mentally put two men into convenient compartments, so that she had a work husband and a home husband. I think she may be resisting abandoning that delusion, because to feel truly remorseful towards you, she has to feel bad about herself.
Part of the problem with my background is that things tend to go the interrogation route, looking for inconsistencies and answers that don't make sense. This makes her defensive. Double edged sword I guess.
I think that your wife is still trying to minimize what she did, and she will resist any attempt to get her to be more open, regardless of the approach that you take.
She would probably love you to rug-sweep and not analyze her statements, but that would not be healthy for you, and most betrayed spouses want to know details, even at the risk of being hurt by them.
The more she reveals, the more she has to feel bad about, so it may continue to be a struggle to get her to open up. I recall that her affair timeline was very light on details, and only mentioned her affair partner, not any events that included you, possibly because of her compartmentalizing. Do you think you will ask her to continue working on the timeline, of have you abandoned the idea?
Really, the priority at this stage is for you to get all of the answers that you need. So using direct questioning has to be a part of that. However, could you supplement that by asking your wife to write an account of her affair in her own words? You could frame it as an opportunity to state her side of things, to describe what she was thinking over the four years.
In the same vein, you could perhaps ask her some open questions, and let her go away, think, and write her response. Sure, you may get a load of deluded airbrushing and avoidance, but at least it would get around the defensiveness you encounter when you ask direct questions face-to-face.
I believe she was more emotionally invested than she believes, not because she loved him, but because of the emotional need for feeling desirable he met. Somehow he picked up on what she felt she needed and exploited it.
It is possible that she does not understand that what she has is like an addiction or dependency. It can be hard for people to admit that their dependency controls them, rather than the other way round. Your wife may be in denial about it, or she may be so used to it being a part of her that she sees it as normal.
As for her AP picking up on your wife's vulnerability/dependency, I do not think he was any kind of psychiatric expert. He probably just tried a few moves that worked in the past, and your wife responded to them. It's like a fisherman throwing a hook into a river and waiting for a fish to bite. That is how opportunists operate, and the chances are that this was not his first rodeo, as the expression goes.
Still doesn't excuse what she did, but he clearly used her. She still doesn't see it that way.
I am sure the man has absolutely no respect for women, and when you have no respect for people, it is easy to manipulate them to get what you want. However, your wife was also using him just as much. He used her for free sex, and she used him to feed her unhealthy dependency. Many affairs are basically two people using each other, often for different things.
Affairs frequently exist in a fantasy world, because the reality of them is pretty cheap and tawdry, often verging on the pathetic. Is it possible that your wife enjoyed the delusion that she was controlling two men while she was having the affair?
If so, the last thing she wants to consider, let alone accept, is that she may have been used by an opportunist who pulled her strings like a puppeteer. Particularly if she thought she was pulling his strings, because her desirability made him her 'slave'.
A smart male opportunist will play up to that, because it gets him what he wants. And the woman will willingly accept even the most blatant bullshit, because she wants it to be true. It is another aspect of the dependency on external validation.
It can be difficult to get sense out of someone who is in a state of both delusion and denial, because it is like dealing with someone who is high on a drug of their own making.
It takes a lot for an addict to walk into a room full of strangers and say, "My name is Dave, and I am an alcoholic". I hope that your wife will find the strength to make a similar life-changing admission, just as you do.