According to the dictionary, a pathological liar is “a person who lies compulsively usually for no external gain or benefit and often with detrimental consequences.
” A person who is a pathological liar will fabricate a complete falsification which is typically overreaching and complicated. The person who is lying is usually aware they are lying, while other pathological liars may actually convince themselves that they are telling the truth.
http://www.tycrib.com/2017/06/signs-that-youre-dating-pathological-liar.html