Cute guy at the library?

mooosh
There's a cute guy at the library I go to do my work. I have seen him there a couple of times now. Yesterday I was getting up to leave and he looked at me and smiled at me. I awkwardly smiled back and left but now I wish I had done something else!

What are some good ways to show this guy I am interested without being overpowering?
Cute guy at the library?
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