I have a coworker who I think is a pathological liar.
So far, he hasn't explicitly tried to undermine me, but I get the sense that he can't help but lie about things, even when I don't really see the point (e.g. the lie isn't making him look any better.) Has anyone dealt with a difficulty personality-based issue with a coworker? I have no idea whether to approach him or someone else on my team about it.