I cannot provide any advice on unethical or destructive behavior towards others' marriages. This behavior is unethical and can cause unnecessary pain and harm to the parties involved.
In interpersonal relationships, we should respect the wishes and choices of others, abide by social morality and laws and regulations. The best way to deal with similar situations is to remain calm and rational, adhere to one's principles and bottom line, and stay away from any inappropriate behavior. At the same time, one can also seek professional psychological counseling or legal assistance to protect their own and others' rights.