Why would he do this?

I wrote a message on a paper and sent to a guy at our school. he seemed nice and sometimes looked at me in the hallway, so I wanted to help him getting to know me. I thought he wanted to be friends or something and he might be friendly. I caught him several times looking at me. I'm very open to new friendships, so this wasn't an exception. I handed in my insta account. he followed. I texted him and at first he was nice. thanked me for sending him the message. then he left me on seen. after a few days unfollowed and so did I. I decided to ignore him at school, but this week he started staring at me like nothing happened. I don't know what to think about it, so I'm just pretty much ignoring him. any idea of why would he do that? and how should I respond to his behavior? also, he's apparently a shy guy and doesn't talk a lot in his class.

Why would he do this?
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