What does it mean when a guy stares like this?

Anonymous
Okay, so there is a guy that I have known for about three years. We are acquaintances, but not exactly friends. Lately I have been noticing that he glances and stares at me all the time and when I look at him he turns his head as if he wasn't staring at all.

I notice that he stares at me from down the hallway or from across the room, but he rarely talks to me unless I say Hello, or something like that.

Here is the kicker, the other day when he asked me do something for him I responded with a wide smile and "Okay" was all I did and his blank face suddenly changed. His eyebrows raised, his eyes had a sparkle in them, and his mouth opened. He looked me in my eyes as if in a trance.

So what does it mean when a guy looks at you constantly and looks away when you catch him, AAAAND do guys who like you look at you as though they are astounded or in the amazed way he did? Thanks for the help (oh and I have the biggest crush on him ever)
What does it mean when a guy stares like this?
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