Lieing freind, what should I do?

Someone who is freinds with me and all my other freinds has started lieing, he has started telling us he has moved into this mive house, got brand new audi cars. But will never tell us where he lives wont go home if where with him and is secretive about his landline number and even parents names. When me or my other freinds ask him if he really has something he will start saying, oh so im a lier no am I? then say we hate him and make us feel guitly