I think that one thing that people are forgetting is that our spouses aren't victims of conniving OMs. They went looking...an affair isn't an oops thing. They wanted it - whether it be with their partner or someone else. The marriage and their spouse is less than nothing. Sorry to be so blunt, but it is what it is. No excuses can be made...
There are moments in this life when you are so confident in the rightness of your actions, that not even for a second do you consider the option that you might be wrong.