Can trust be re-build in marriage after adultery?

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A friend of mine, JK, shared her marriage problem with me. Her husband had a relationship with a younger woman for many years. When she found out about it, she was really furious. She said she felt like the whole world had crumbled and that her life would never be the same again. She loves her husband very much. After reflecting much, she decided to go on a battle with the woman adulterer. In the end, her husband chose to stay with JK and they remain as a couple to this day. She said it was not a one man's work, of course, her husband and the mistress committed a really grave sin but she found out that many people around her had known about the adultery long before she found out. She said even some family members knew about it but they chose to remain quite. She has forgiven her husband and her husband is also doing his best to make up for the pain that he inflicted on her for so many years. She said it is not easy for her to trust anyone anymore. Even if her trusts for her husband is regained, she said she would never trust the people around him...his friends and his family. She said the world seems so lonely for her now. But if that is what it takes to save her marriage and her family, then nothing else matters. What do you think mylotters?