Why is this guy taking screenshots of my Snapchat story?

There's this guy who I don't know very well who I'm friends with on Snapchat. I post a lot on my story, and recently he's started taking screenshots of selfies I post.

He doesn't screenshot /all/ of them, but I noticed he screenshots every single one where I've made a reference to myself being hot (i. g. "Wow it's hot outside today... maybe it's just because I'm out here")

Obviously this would indicate interest or something, but I know he has a girlfriend already, so this makes me a little uncomfortable. Should I do something about it, ignore it, or am I just reading into this situation too much?
Why is this guy taking screenshots of my Snapchat story?
Post Opinion