In this case, I would not get him fired. (I would if you were living here, because you would have PLENTY of people on your side)

Keep ignoring him. He's trying to scare you and if you come across as not caring if he exposes anything about you, then he has no ammunition.
He sounds like a bully, but I'm thinking that he's all bark and no bite. He knows you can get him fired, and without a job he probably can't get married. Correct me if I'm wrong, here.