
......I don't know how I feel about the husband anymore. I thought he should get kicked to the curb. I wish he had these revelations before sexing his coworker.......

I think part of it for both of them was before they could make the excuse of "I don't get why he/she is so upset (about the lack of intimacy). It's not like I cheated on him/her." Now that they've cheated, they're forced to admit how poorly they've treated their spouse. And now they have to improve if they don't want the very real possibility of their spouse leaving. It doesn't happen in most cases, but I have heard some stories about a husband cheating on his wife and feeling so guilty about it he tripled his efforts in the marriage. Guilt is a powerful motivator, especially when the other person hasn't don't anything wrong to you.
Anyone know if this is a webnovel?
Yes it is
I've been reading it in English here https://lightnovelheaven.com/series/under-the-oak-tree/
and there's also a Riftan's POV backstory as well!! https://lightnovelheaven.com/series/riftans-pov-under-the-oak-tree/
nice to know, thanks