What went wrong with him?

well, i befriended someone online, with good intentions, i'm a girl befriending this guy coz he gave good answers in y answers..well he was wary of me first, asking y i became interested in him., which is strange to me at first, coz everyone do this thing without much thought or questions. .he asked so many questions which i gamely answered. But when i asked for his real name, he got scared, and I dunno why. Isn't that the first thing should know when befriending someone? Then he slowly faded away.Strange!