Have you considered the possibility that his "real life" is not at all what you see his online life to be? I run across people from time to time who build a whole persona around their online identity that has no resemblance to who or what they are IRL. Their online representation of themselves is a fraud built from their fantasy world.
I certainly would not place an inordinate amount of time fretting over such a relationship. If he does not want you in his "real life" there's probably good reason and you should run like hell. Sorry for the bluntness but it needs to be said.
I wish you the best,
"Life's journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways, totally worn out, shouting 'Holy Shit! What a ride!'" ~Hunter S. Thompson