Need advice..

tu say he shares everything with you... That's not something most guys do, especially not with a girl. I won't ask what kind of things he shares with you, but guys mostly keep personal thoughts and feelings to themselves, unless they really trust someone. He must really trust you. That can be a sure sign.

The only problem with that is tu only mention that tu talk over facebook. He can say anything he wants online. I'd personally feel más comfortable if I could have a face to face talk without it being awkward o whatever. But that's just me. Be careful, some guys are nice on the outside but when tu get to know them, they're totally different. Just be careful and maybe (I hope) I'm wrong about him and he's genuinely a great guy. It seems like he is but please be careful :)

Before we start... ENGLISH, DO tu SPEAK IT?
I think tu should tell him what tu exactly feel for him. But first, tu have to be certain of your emotions because sometimes, crushing isn't enough.
Make sure he knows what he means to you.