Why did he do that?

I have had a crush on this one guy for a while now, and its pretty obvious. So he most likley knows. And this one day, I was sitting outside of school waiting for my friends so we could walk home. Anyways, while i was sitting there alone, he walked up and stood a few steps infront of me and just stood there staring at me. I was looking the other direction but i could see him out of the corner of my eye. I turned and gave him a slight smile, he then smiled was about to say something, rubbed his neck then walked away. Do you guys have any ideas on what he was trying to do?
Why did he do that?
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