If a guy calls you his Best Friend, could he still like you?

So I've known this guy for about 6 years and we talk about everything.

I know so much about him its not even funny.

He has told me some things that he has never told anyone, and most guys wouldn't.

This year, he wrote me a card and he called me his best friend.

I've known that we were always really close, but I never thought we could be this close.

I used to like him, and he knew that, but I'm just wondering if he could like me now...Help please.