Liar, liar.

Do you know a liar?
I do.
It's a person within my close circle.
He tells lies all the time.
He tells huge lies and stupid, pointless lies with the same unflinching gaze.
He gets really angry if he is doubted.
He has no word.
He is often caught out.
He brazens it out usually - "So what!" kind of thing.
He blames others (including me) for forcing him to lie!!
That drives me nuts.
He promises faithfully that he will never, ever lie again.
He does.
Again and again and again.
What to do?