Why does my crush never smile at me?

LILI101
I really like him. We only have one class together and sometimes see him in the hallway. I always stare at him but i never smiled at him because I'm to shy or even talked to him. When he caught me staring for 3 seconds and he look away but he never smiled back. Should i tell him i like you?
Why does my crush never smile at me?
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