Liars are afraid of the truth.
They dig themselves a hole and don't no how to get out of it so to speak, so they dig deeper and deeper, hence compulsive liars.
My brother is a compulsive liar, he is also a compulsive thief, they go hand in hand, we,ve tried helping him to no avail, hes 46 years of age now, hes been the above for 30 odd years, funny really, his 4 brothers, 1 sister & mum & dad ain't like this, i suspose this is where the saying ''BLACK SHEEP OF THE FAMILY'' comes from, its a shame but their are many thousands like my brother out their