Why would a guy stare at me all the time but not smile?

glowgirl3
Why would a guy stare at me all the time but not smile. He isn't frowning but he just has a blank look on his face. My friends have caught him staring at me a few times. He knows that I like him and I've been told that he likes me but I've been wondering if he doesn't anymore. Sometimes he'll hold my gaze for a few seconds and then other times if I catch him staring he'll look away really fast.
Why would a guy stare at me all the time but not smile?
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