What does it mean when a guy stares at you whenever you smile or laugh?

We're in middle school. Me and my crush are really close and good friends. Anyways, I have noticed that in a while that everytime I smile or laugh he always seems to stare. Like on Friday my friend (a guy) was making me laugh and while I was laughing my crush had turned around and he started smiling. Later on that day my same friend made me laugh again in the classroom and he was looking at me while I was laughing. Also, he gives me blank stares. Like that day I was smiling to myself because I was thinking about something and I hadn't noticed that I was looking at my crush while I was smiling but he was actually staring at me with a blank stare with his mouth slightly opened. So, what does it mean when a guy stares at you whenever you smile or laugh?
What does it mean when a guy stares at you whenever you smile or laugh?
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