If he is a sociopath- which is very likely, a lawsuit will not make him do anything and will not make him pay a dime to you. Consider your lost money as tuition in the school of hard knocks. I think truthfully if you can relocate to another city that would also be wise. Lie low until he finds another victim to work out his issues on... he will go away when he can't get what he wants anymore and finds another -naive? young woman. These guys do not change EVER. Read some of the books written by Ann Rule and you will see what I mean and you will learn a lot. Seriously! And sincerely!