Hanako is the only trash here, she love Nami and Nami love her, it's normal for Nami to hope the husband discorvers their relationship, because she love her and want to be with her. Chapter 3 and the guy still seems to not deserve that, compare with other series where the man is always trash and they assume the NTR is a good option when the man is trash...
Hanako has a cute face and I think it's made on purpose to be less harsh on her and maybe more with Nami.