How do you get a narcissist to keep to a financial agreement?

How do you get a narcissist to keep to a financial agreement?
Hi, Lisa,Think of it as a prospective credit transaction. If he believes that an investment in you will pay off sometime in the future (in other words, that one day you will again become a source of narcissistic supply) - he may give you something.If he believes that he stands to lose more than he stands to gain - for instance, if you threaten him with effective legal measures - he may give you something.But if you repesent no reward and no punishment - why would he depart from his hard-earned money? Answer The best way is to have it in writing. My ex-fiancee owes me money and I will have to take him to small claims court.