Why do guys send random snaps as a response?

I'm literally so confused! this guy asked for my snap. I thought he genuinely wanted to connect. But Everytime I snap saying something. He responds with a random selfie, picture of the floor/shoes or just something entirely random. And he gets upset if I leave him on open! What am I supposed to do I'm trying to have a conversation. Sometimes he responds saying something but it's minimum. I was interested in this guy but I don't know at this point.

Why do guys send random snaps as a response?
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