Man... this is a cold day in hell when Bread, Tennisrash and I find ourselves agreeing on the same thing.
As someone who has been cheated on in the worst of ways... yeah, delete these people. Seriously. There is a level of serious human depravity that allows someone to willingly betray a loved one like this.
It has little to do with the "time and era", it has a lot more to do with respect and morality. The fact that someone consciously makes this choice (assuming it isn't an open relationship... which is a stupidly greedy conception in and of itself...) is just disgusting. The woman isn't really to blame as she never made a commitment to this man's wife...
This husband on the other hand... well some people really shouldn't be allowed to find themselves in a position to love another human being. Disgusting.