Is there a phone number you could call to find out if your friend is a pathological liar?

As far as I know there's no way of phoning for an answer, but you could try a general helpline if you are distressed. What really matters is whether YOU decide your friend is a "pathological liar" and whether you want to keep a friend who lies to you habitually, as a matter of course. In other words, you're being put through something hurtful and insulting. (I wouldn't worry about whether it's "pathological" or simply habitual). You need to take care of yourself. All the very best. Joncey