Just caught up with this. I'd have had to have undergone a resurrection if I was Shirley Glass Eurostar, but I'm glad that I'm able to at least represent her work, with the caveats I mentioned downthread.....
Hubby I do think Eurostar's main point is worth pursuing and is what I alluded to in one of my posts - that this affair possibly has links to your wife meeting her life partner so early. This is what I meant by the needs not being able to be met in the marriage. I think that curiosity is worth pursuing, because it might not have gone away.
I completely understand that you are not driving the transparency and therefore your wife is carrying on as normal. It sounds as though you are shadow-boxing eachother a bit; she won't talk if you don't ask any questions and you are afraid to ask too many. I understand your fear about raising the issue of the affair in every unrelated disagreement, but I would suggest that the reason you are having these apparently unrelated skirmishes is precisely because of the affair, but it seems somehow "safer" to believe that they are about other things.
I'm so pleased to see ILMT on this thread, whose testimony will help you so very much, as she is an incredibly self-aware, generous poster who has been able to illustrate the concept of individual and lifestyle vulnerabilities so pertinently, through her own story.
Because likewise, one of the issues your wife will need to explore too is how she was able to not only give herself permission to betray you, but also how she was able to square intruding on the OM's marriage.
I would also add that your wife's understanding of her affair will not be instantaneous - true understanding of her thought processes can take some time, but I reiterate that she needs to understand this even more than you, because she is the only person who can prevent this happening again. She might benefit from her own solo counselling, but with a challenging therapist who understands infidelity.
Finally, bear in mind that you might be in crisis mode at the moment. Those early weeks are really quite energising and the most urgent and important issues seem to be about hanging onto the marriage and keeping a semblance of normality. Be aware that after the drama and crisis has passed, many people hit a kind of wall, when depression and overwhelming sadness can overtake the betrayed partner. These are the realities that the posters who seek to minimise infidelity and its effects never seem to take into account, but forewarned is forearmed.
Really, my overwhelming message to you hubby is that you both need to understand why this happened and what steps you can both take to minimise or eradicate the vulnerabilities.
My perspective on affairs is always the same. Good people can do bad things for a while and having a secret affair does not have to define a person, as long as that person realises that to have an affair, it is necessary to deceive, lie and hurt so many other people. The collateral damage after one's own selfish actions can be enormous.
In this sense, having an affair of any kind is not just about finding monogamy constricting or the very human failing of falling prey to temptation, but for a time, a person who perhaps in the past has always put a high premium on being honest, ethical and truthful, must abandon those values. Monogamy is therefore not the only casualty of an affair; the very essence of a person's former character is altered. The true measure of a person is whether she learns from the experience and what she learns about herself. The person who minimises it and never really learns from the experience is at greater risk of it happening again and her character remains forever altered.