You go out with your husband for dinner at a new restaurant you have not frequented before. It is in a part of town you rarely visit. You are shocked to see your friend’s spouse having dinner with a very young, attractive person. From the way they are behaving, it is obvious they are more than friends. The couple finishes their meal and leaves without seeing you. They behave very affectionately on the way out the door. Do you tell your friend, knowing you probably will not be believed and it may ruin your friendship?