My husband and the mother of his older children had a one night stand years ago while married to me. She and I have developed a cordial relationship through the years and have worked to build our blended family. However, my husband recently disclosed his old affair with her and I feel like she has this secret that I don’t know. Should I let her know of my knowledge of their one night stand? My husband and I have reached a place of sharing everything with each other to strengthen our marriage. Also, I want her to know I forgive them and want to be able to work together for the sake of the children and grandchildren.