What does it mean when a guy looks at you from the corner of his eye without turning his head?

Anonymous
The guy I like does this to me. We met at college. I think he likes me. I noticed this a lot when he somewhat expects me to show up. When I walk up behind him, he doesn't turn his head much but I can see him peeking at me from the corner of his eye. When it's his friend or someone else, he's normal and fully turns his head. Sometimes he does this when I sitting next to him, like he's trying to steal glances.

One time we were in an empty classroom doing work. There was a class starting in that room so he decided to move to a different room with his female friend. I decided to go home so I followed them out the door. As I followed them, he looked at me from the corner of his eye again, not really turning his head. His female friend looked at me (not the same way he did) and then she looked at him and smiled.

Oh and this was the same day he started getting more nervous around me, glancing at me a lot and next day he was very shy and actually stopped talking to me.

What does this mean?
What does it mean when a guy looks at you from the corner of his eye without turning his head?
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