Unwittingly roping the "accomplice" into her amateur hour sleuthing of her husband's mysterious second life should go wonderfully.
I hope we get a bit more insight into their marriage from her perspective. We know that he thinks of himself as this hopeless nobody for whom all marital intimacy is long dead. We see her low-grade abuse him in the earlier chapters and disparage him as a man and marital partner, but after that point....nothing, and her actual demeanor seems to have shifted away from that entirely.
It feels like her initial portrayal was meant to set up a "see? The husband has a reason to 'step out' on her because she's mean and is withholding sex" type of excuse, but then that line sorta appears to be abandoned - and the wife's no longer really acting that way, and even seems to (in this chapter, at least visually) think back on their marriage and life as relatively positive and pleasant.
Feels like a bit of a mismatching of tone, but I don't want to be hasty and call it a screw-up on the part of the author, or anything - so I look forward to getting more information, and hopefully more context as to how they both really feel about one another and the state of their marriage.