DEAR ANNIE: My husband and I have been married for more than 50 years. We have had a great life together, sharing a lot of the same interests. We had a great friendship with another couple. Several years ago, the husband caught my husband and his wife sexting each other. I do believe it was a one-time thing, as she was drinking and the circumstances pointed to being a one-night thing. I wanted to forgive and forget, as she was a really great friend. However, her husband insisted that we have no further contact with each other. We have another friend who is a single mom with two grown children….