Betrayal of trust

Your mother died when you were 12. Your millionaire father was heartbroken. After 6 years he finally started dating again and soon found his now fiancé whom you’ve met once. At the time she seemed nice but as you help out at the wedding venue you overhear her telling her guest on her plans to steal your father’s money. She soon finds you and claims to her friends that you are trying to steal her fiancé, your father. Do you confront her with the truth or let her dig her own grave