7 things you need to know about infidelity. From Shirley Glass' afterword: "Real people wish they had had the foresight to prevent infidelity before it wreaked havoc. When they say, "I wish I could go back in time before the affair," I ask what information would have helped and what they would say to others. They tell me that they didn't know how good friendships could imperceptibly cross the line. It never occurred to them that good people in good marriages could be vulnerable to betraying their partners. Some say they would have worked to fix their marriage instead of running away from problems. Many never considered how much pain their actions would cause, or how long it would take to heal." Her book: Not Just Friends, is a great resource.