My husband’s older brother married another woman while already being married. Despite knowing he was married, the second wife had a relationship with him. When his first wife threatened legal action, police intervened and the second wife went back to her parents. My husband claimed it was a mistake and apologized. But he was caught again with the same woman in bed, seen by his parents, mine, and neighbors. He claims they’re not married but wants to be with her. What can I do?