Would you forgive this honestly? Please be honest.

This isnt about me but is about a friend. A friend was in love with a woman and ten years later he just found out that she cheated on him emotionally with his best friend this happened ten years ago. He asked that in order for her to gain forgiveness and continue the relationship that she confront the guy she had a affair with and his wife about what happened to make sure that the relationship doesnt continue because they are still "friends". Do you think he is wrong for feeling outrage? Do you think that he should just forgive it because it happened ten years ago? Do you think his request for her to gain forgiveness is too much?