well if it was me, I already suffered enough, the rewind is a chance, I don't want it to happen again, this time around I will fight for it tooth and nail so that i can have a different ending, i will take the things i know in the future as an opportunity
as for the husband his actions on the first timeline doesn't justify jack shit, his a irresponsible asshole and that's the only thing i will remember even until the end, if he can stay at home like right now why it did not happen on the first timeline, it means his the problem
Its part more lived experience the second go round, and part that thing that happens to us all after something shitty, where we stay up dreaming of what we should have said....and now that time has rewound they can say/do the things that they "should" have.
The dude tho...yeah still waiting for a good explanation of why he just left their first night. Even if he didn't have the guts to consummate, at lest show up.

... the plot...
If he really loved her, even in tge 1st life(before the rewind), then everytime he came home, even if it wasn't often, he would've noticed the changes to his wife. Weight, dressing, demeanor, etc.
I don't think being bashful is enough reason to justify that he chose subjugating monsters on their first knight??? Is it the differences in perspective? Because if I were the man, I wouldn't have let her know that there is a subjugation going on and atleast stayed in the room with her. No matter how awkward it is, just to see her face or atleast feel the mood. Since I'd choose to celebrate my first 24hrs or smth with her, though I'll probably end up appearing cold to her due to stiffness.
I really don't like this about rewind webtoons(but i still like the overall, just the idea), is that they were very timid in the first life, but after the rewind, they're suddenly badass women. I mean... what the? Personalities doesn't change that easily. Duchess of the glass house is an example of rewinding and showing that she is still scared and the timid duchess before the rewind, but she is making and effort to change.
There are still more but I don't know how to put it in words... but because I like badass leads, I'll just disregard the first life for a tiny bit wahahha(๑•ㅂ•)و✧