Why does he keep leaving me on read?

This guy keeps sending me different bits and pieces on snapchat. Like photos of himself (silly ones) or ones in the morning that say good morning. I reply back to him but he leaves me on read?
Some of the ones he sends me are specific to me but yet he still leaves me on read or ignores my messages.

Whats going on?
Why does he keep leaving me on read?
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