Ignoring my snaps?

This new transfer in my grade just added me on snapchat. we had been casually snapping back and forth then all of a sudden he opened it and hasn't responded. i've been nothing but nice to him and i hadn't sent anything that would make him mad. nor have i been double or triple snapping him to get a response. why is he ignoring me for no reason?
Ignoring my snaps?
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