Why does a guy always notice whatever a girl do?

I have this guy friend, and he always notice me everything that I do. I mean, yes.. whenever and wherever! Even in facebook. During the times that we are not yet close, he always leave a comment whatever I post on my instagram account. And by that time, as far as I remember, that was the time that I started to develop feelings for him. And he didn't know. Until now, he was like that whenever he was around me. I don't want to assume anything. But that was my friends vision of what he is doing with me.
Why does a guy always notice whatever a girl do?
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