What does it mean when a guy smiles at you as soon as he sees you?

Anonymous
So a few days ago a friend of mine celebrated her birthday in a restaurant. My other friends and I were invited and so were my crush and his friends.

So when my friend and I entered the restaurant, he looks at me and kind of smiled a bit, I noticed that his eyes kind of "smiled" along too. And then as soon as he knew I caught him smiling he quickly hides his face from me and pretended to talk to his friend. From what I know about him, he's the shy and awkward type of guy.

What does this mean?
What does it mean when a guy smiles at you as soon as he sees you?
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