An ex boyfriend owes me $15,000. I have proof with emails and credit card statements. What can I do?

How can I get him to pay? He's a grifter and con man and has done this to others.

Get a lawyer

The only way would be to take his butt to court. Make sure you have plenty of proof. You may not get anything back though. Consider it a hard lesson learned and don't "lend" anyone any more money.

If the money was taken by him without a contract to repayment he would just come back and say its a gift. If you don't have contract about repayment of the money with a signature and date of repayment you are out 15K. Sorry learn from your mistakes.