Should I move on?

There’s an introverted guy. He stares at me, says hi, smiles at me. I introduce myself and we had a brief talk. Then, I saw him at bookstore and I went to him. We had a brief talk. In all of these conversations he was serious and calm. Regularly I see him at school. While passing each other, we smile at each other and say hi but he doesn’t take initiative to talk. Should I comment this ss he isn’t interested in me?

Should I move on?
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