This is a story of a guy who kissed someone and later confessed to the wife, this later spun off into a divorce.
She prefers never to know about it because that will spare her the hurt. She believes that if someone loves you they should spare you the confession.
Affairs are not always about horniness and selfishness. When people are together communication breaks down and needs are not met (physical and emotional). Often cheating is a symptom of something larger beneath the surface.