Lodge an FIR with the police. Your identity will be anonymous
humorousicecream1
Don't hesitate tell me your city, if possible I'll provide you contact number of police officials who will sort it out without causing any harm to your personal life,you both will be called in office and they will create evidence that he was blackmailing you and they will not lodge FIR,in future if he doesn't change his mind and try to do the same thing then you can lodge and that police official will support you in court