personally i think that...maybe it has nothing to do with being a secret, or pushing too hard...
i'm sorry if this might hurt a little but it seems your a bit obsessive? -thats putting it harsh, sorry-

the reason for me in saying this is, maybe he feels that your relationship has nothing to do with other people, maybe he doesn't see you as something to advertise? -please i hope that didn't come out wrong- and you pushing him -in a matter of speaking- into such a deep relationship so quickly, might not be helping...remember, some men are a bit too...carefree on some things, just like woman are on others...he might not have realised before that a simple thing could mean so much to you...

oh and last thought...don't regret or give up so quick, that might push him away more...