If he does not have a girlfriend and you like him in these modern times girls often ask guys out. Some guys could be just shy. Take the risk and ask him out.
I've made my fair share of mistakes, and if I can help you avoid a few, I'd sure like to try.
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If you're interested in him and feel like there's mutual attraction, it could be worth making a move. Just be sure to communicate openly and gauge his interest before taking any major steps.