Why would a guy keep staring at you when he thinks you're not looking?

This guy in my class keeps doing it and he also finds excuses to talk to me. For e. g., when I'm having a conversation with someone else and ask them a question, he'll answer it 😅 and gives his opinion even though I don't ask for it 😅
Why would a guy keep staring at you when he thinks you're not looking?
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