Hmmmm, at the risk of becoming even more unpopular....
If you cruise over to the Other Woman website, you will see that the other woman is, um, shall we say, um, a tad naive????
She believes everything out of the mouth of this guy, knows that his wife is killing him, hasn't slept with him or cared what he said since 1972, and she is going to rescue him.
It's very sad, really.
That is why they, as a group, tend to get very very upset that the married man won't leave his incredibly nasty current life and live a life of perfect happiness with her.