My mother was a pathological liar. She tell lies until she actually believed them. It was morbidly embarrassing when I'd meet someone my mom knew and the person would say, "How's school going this year?" I would be completely confused - until I'd find out that my mom had told the person I was an elementary school teacher (because that was what my mom wanted me to be). Awkward, to say the least.

If someone consistently lied to me I would block the person. The lying would creep me out.