What does it mean when a guy gives you a double look?

Anonymous
There's this guy who sometimes waves and smiles at me. We don't talk though, and we rarely actually interact. I feel like we share a lot of eye contact though. There's just something there, but I don't know exactly what. I just k ow that on my end, I feel happy when we smile at each other and want to find out more about him. Today I walked past his table at lunch to go to the restroom, and he kinda glanced at me while talking to his friend. When I came back and passed his table again, he looked at me, then looked away, and then back again really quickly. Almost like he was stealing glances at me. I kinda did the same thing and when we both had looked again, I smiled at him, and he smiled back. Like the kind of smile that you get when someone else's smile is contagious.
What does it mean when a guy gives you a double look?
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