[Duchess]

Has it happened before with this person?

If the person is notable for talking about you... then it's safe to say that he might be lying...

Otherwise.. you can ask other people that he talks to about it. Preferably people who actually like both of you.

The main problem with this, is that if it's supposed to be a secret... then I think you're better off in ignorance ^^;;

If someone is not saying something to your face.. there must be a reason behind it.. whether it means they're cowardice or it's really not something you should know about.

Also... imo, the fact that you -think- it's about you...means that you -do- have something related to what he said... whether negative or positive. I don't know any non-paranoid people who just assume that people are always talking about them without a reason or past experience.