Why does he (my crush) look at me when I'm embarrassed, meaning why does he just keep staring at me when I'm embarrassed?

I made a mistake by leaving an ongoing class one day, and after I returned, I felt humiliated. I looked up after going in the class, a few people looked at me but just continued on with their work, but I felt a presence of someone looking at me. I looked up a little and saw him looking at me a little. Why? And I don't know if I'm wrong or my imagination, but I did also have a vibe he was smiling or laughing a little without sound (although he doesn't seem like the type because he asked to be friends and talks to me sometimes). But I couldn't really tell. He was wearing a mask. But why? Why was he looking at me after?
Why does he (my crush) look at me when I'm embarrassed, meaning why does he just keep staring at me when I'm embarrassed?
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