NTR & Cheating tags, huh. Not to mention with a title like that...
At least you know what you're getting into I guess. I feel kind of bad for the husband though, even that ending when she invited him on a date, I can't help but feel it's just to keep him happy enough that he won't suspect anything is going on.
I rarely feel sympathy with the "cheated" husbands. In stories like this here they make their wives unhappy and unwanted. From what we know of this story I would say he deserves it like the wimp he probably is =)
The reader is never is given that impression about her husband. Maybe you can reach a bit and say she's being neglected at home, but logically, that's it. With that said, I'm not sure if I wanna place a lot of blame on her. Both of them were caught in bad circumstances.