She shouldn't tell the wife because she needs to keep her job and in my really miserable mind all relationships are "open" and people cheat on each other it's like a known unstated fact about the reality of romance.
I won't comment on the wisdom or morality of helping a boss cheat on his wife, regardless of how much we may think she may need her job. If I did comment on it I might suggest she needs a little self respect too, perhaps even more than she needs the job. I also might suggest Prudence go take a walk til her hat floats.
I will say the second half of your comment, GB, is incorrect and doesn't recognize the many men and woman who would quite literally die before they betrayed their spouses. Your mind isn't miserable; I'm guessing rather that you have been betrayed by one or more of those who have no trouble betraying people they supposedly love.
mud