One thing seems to hit me with these stories: instead of talking with their partner about their frustrations, they'd rather fuck with someone else. What is wrong with these people?
Well...I mean, her husband went to a brothel to fulfill his needs, and in a way this is her doing the same, but without paying?
I feel like now that she gave birth she could just ask her husband if she was frustrated...But I guess the neighbour just happened onto the scene at an opportune moment, and what was supposed to be a one time thing continued because her husband just can't satisfy her anymore.
I guess I feel a bit bad for the husband, she seems hooked on cheating with the neighbour and he's none the wiser. Sure there was the brothel thing, but considering the panel where he had sex with her, it's probably safe to assume he stopped going to the store since she already gave birth.