Even if you are casually dating this person and far from being in a serious relationship, having to deal with lies all the time can quickly turn things sour. They just did not know him, was what I kept saying. He never picked me up from the airport. Whether it is a narcissistic personality disorder or a sociopath personality, lying is usually a part of their entire persona.
While the rest of us duck and weave when caught in a lie, the pathological liar has their do-over front and center and on demand. Even if he was sick, he could've at least let me know he wasn't able to pick me up and see me on my birthday. A lot of them had to do with the atmosphere I grew up in. I had no idea that he was a compulsive liar at that time. Although most pathological liars do believe their own lies, some do come clean.