Liar

I was chatting with J over the suspect. Well, the guy... I will address him as Y. He is a secretive weirdo. Everyone in KZ is saying that he and J are couple but she does not accept him. Well, since J is my friend and I know something about Y, somemore I am also suspecting his motive so I talked to J and we discussed about this.
First, Y told me that he works related to machine maintenance. But he told J that he is a general manager. Well, which is true? Or maybe he is just telling lies? Then he told me that he is now living with his family. But he told J that he is living with his friend. But J is also suspecting that he is lying because he once online talked to her but suddenly wanted to offline saying that his mother wanted to use the computer. Well, he lives with his friend but his mother wants to use the computer. Which is true?
Last week I saw Y's nickname in msn saying that he loves another girl. But he changed the nickname very quickly. I know the girl also. But as I know, the girl is already attached. I told J about this and she tried to look for some clues from what the girl posts in KZ. But J was unable to find out any clue. She said that maybe she should pretend to accept him and tried to find out the true colours of him. This is very much like in a detective story. But I do not thnk that it is a good idea. It is not a good plan since it may be a risk for J.
So, both of us think that this guy is always lying to others. J suggests to report him to the management of KZ. But, even if he is kicked out from KZ, he still can use other identity to cheat other girls in KZ. What can we do to such liars? Sigh.... There are really a lot of weirdos out there.