Most Helpful Girl
seems really suspicious to me . He's trying to hide something from you or he is hiding you from him.i mean he want to prevent you from having access to his information and having contact with him or he want to prevent himself from having access to you.so to not seems too desperate by sending you too much messeges or he try to stop himself from being jealous when he sees your updays or when you don't talk to him when you re online.
look it's a complete waste of time trying to figure out people's motivations and usually even if you did get the answer, you still wouldn't fully understand.
obviously there's something going on, he probably doesn't want his friends to find out about you... if he's hiding your relationshipat the real worl too this would be extremely suspicious and then I really think you should break up with him, because you shouldn't be hidden at all and deserve someone who will not do what he does.
but If you really like this guy and want to stay in a relationship with him then don't worry about Facebook. Facebook has very little to do with real life.
go talk to him ...