What was he thinking while looking at me?

I have a crush on this guy and during the lecture break at university, i was sitting at my desk, while he was standing down there near with his friends.
I always observe him a bit during lecture and i thought that would be the perfect moment to oberseve and admire him, since I could see him so well and he probably wouldn't notice, since he is involved in a conversation.

Than all of a sudden he began to look at me. I got nervous and looked away by turing my face to the right. I than looked back at him and he was STILL looking. I again turned my face to the right then and looked after that to him and than he was STILL looking and slowly got his eyes off me and focused on the converdation.

-i am now worried, that i might have observed him way to obvious and that he noticed and looked at me because of that.

-i also worry, that he knows now that i have a crush on him. I think i told him by looking at him and than looking away multiple times and always looking back at him.

What was he thinking while looking at me?
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