What kind of liar is he?

-He lies about where he's at, for example; he will make a Facebook post saying he's at the movies when he's actually at home. He's a homebody. 
-He lies about who he's dating, for example; this person has a first name, not a last name. There is no picture trace of this individual anywhere. He makes false posts regarding this made up person. The person doesn't exist! He makes up false conversations on a fake phone number pretending it's them. 
-He likes to make himself look lavish when in reality he's the dependant. He lives off his mother. He lied about being a person whom inherited millions from his dead father. He claimed he is in line to own a multi-billion dollar company. When in actuality, he's never had a job and every penny he gets goes to drugs and alcohol
There is so much to describe in this person, I've fallen victim to his lies. Does he have some kind of underlying mental disorder? Or is this symptoms of withdrawal from all the drugs he's on? It's scary cause when you confront him about it, he just continues the story as if it actually happened. I know it's all BS, cause I've known him long enough to see through his façade.