Dear Amy: Many years ago, I started a musical group with two members of my extended family. We were good! One day out of the blue, “Keith” said, “I don’t want to do this anymore,” and quit. This broke my heart. A short while later, I found out that he had joined another band and had taken our one remaining band member with him; this new group recorded a number of albums, toured part of the world and had critical success. Approximately 20 years later, I get a letter from Keith, saying he wanted forgiveness for hurting me.