A pathological liar is someone who is addicted to lying much the same as someone who is addicted to drugs, gambling, etc. This means that the continuous choice to do evil becomes hardened over time into habitual evil. A habitually evil person will not be in heaven even if he cynically 'repents' because God Who created the universe and all life is the only One Who can see into and know the thoughts and motives of all people.
I do too. Three good examples are provided in scripture.