When a guy stares at you with a blank expression?

Okay, so this guy i like has done this multiple times. I'm the type to ignore and pretend i don't see him when he's doing this but when we pass each other, he looks at me for a couple of seconds before pretending not to see me and doing something along the lines of talking really loudly or laughing. We've made eye contact on numerous occasions, both of us not smiling. Its normally me who looks away. What does this mean?
When a guy stares at you with a blank expression?
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