I like a guy, not sure how to go about it?

Basically, I've liked this guy for around a month or more now. He's quite nice, sincere and seems to be a good person but I've heard stuff about him being really "pervy".

But the thing is, I have NO idea how to go about showing him this as we've only spoken twice - the first time where he initiated it as we were standing near each other, the second time I did (online).
Both conversations were super short..

I am not in any of his classes, but I see him in the library most days. However, he is always with his friends and quite frankly I am not going to go up and start touching and laughing with him while he is with 4 other guys.

So, my question is, what is the best way to flirt "from a distance"? I'm not very keen on the idea of starting conversation online again as we're not really friends and there isn't that much to talk about
I like a guy, not sure how to go about it?
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