What does it mean when someone screenshots your snapchat selfie?

Hey, some random dude added me on snapchat a while back but I know for sure I've seen him around on campus before so he wasn't completely random so I added him back. We never talked though-- on snapchat or in person. I don't even think we see each other's stories to be honest. But today, he watched my story about a random rant, and then he just snapped me a selfie of him in a class. I replied with a selfie with a similar facial expression and he screenshotted it and that was basically it... Later on today I posted another story where I was posing with my younger brother for a selfie, and he screenshotted that to...

Is it something I should feel weirded about? Or is this normal?
What does it mean when someone screenshots your snapchat selfie?
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