What we think is irrelevant. It's up to a judge to decide.

This seems like a clear and obvious scam............

Can you be sued? Yes Will he win? That is up to a judge, but my money is on him.

There is no legal impediment to doing a background check.

18.......................................................................

Unfortunately you will likely need to retain counsel in both states.

Call the police...................................

Not unethical. You really need to retain counsel.

Not unusual. Not grounds for a lawsuit...............

Probably not, but you obviously have an attorney. Ask them.