Yes, I mark my life differetnly from the bomb. The whole sense of living in a safe world was blown to bits.
This might help: Give yourself a week to think about Mrs. S's information. You have time. Don't panic, don't rush. Play your cards well.
Classic DB will say, don't involve more people, it creates drama. It will make you lose focus on GAL and 180. You will spend all you energy on worrying about the effect each conversation that others have with your husband. You are already losing sleep.
It will also embitter Mr and Mrs. S towards your husband if you guys reconcile. You hysband will resent being considered a "problem" in the commnunity. It will make your piecing together stage longer. In addition, if Mrs. S talks to him, it will feel to your husband like a tactic of yours to push him and the OW apart, which might actually draw them closer together. There's nothign like persecution to make them feel like romantic martyrs, like Romeo and Juliet.
In addition, will anything Mrs. S will say really tarnish the OW's image to your husband? I don't know.