@gorikopoi: I am in the same boat as you and this is not the first time this has happened to me. I am also talking about grands.
You help people and after that all you have to do is worry and take tension for nothing. How to know who to trust and who not to? You never know a person until you give him money.
I have enough proof against the person. I might also hire a private detective and make him pay all the lawyers and detectives cost.