Yeah... it is not NTR.... it is actually cheating, plain and simple... just get a divorce if your marriage is failing, or the "too much trouble to get a divorce" is enough for you?... just because there is no more chemistry between them that doesn't make her any less a cheating bitch... I mean this is obviously a ploy to create some drama later but don't try to justify her actions as acceptable just because you don't like the "Dopey loser"... but hey, that is just my opinion... also I don't really care, it's a work of fiction but that was a weak argument