Why would a guy do this? (Short question)?

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I met a guy at the beach and we have each other's #s, snapchats, fbs, & instagrams. He's a year older- he always likes my photos & has thousands of followers (mostly girls) on instagram, so I guess he's normal/somewhat popular? We text & fb all day & snapchat a LOT, but he screenshots ALL of my snapchats. That's the only sketchy thing about him. Most of the snaps are pictures of myself, and it's not a glitch. In the beginning, he told me himself, "I screenshot a lot haha". Why would a guy screenshot ALL of a girls snapchats? He's never flirted, hit on me, or complemented me.