What is the smoothest way to ask a guy if he is single and what are the best ways to flirt with him?

Anonymous

So there is this guy in my club who constantly looks at me and we have recently started to share short conversations during club meetings and he has joined me and my friend for dinner a couple times. I have a crush on him but I don't want to make a move unless he is single, so how should I go about asking him without letting him know that I am into him. Also what do guys prefer when a girl DOES start to flirt with him? I know physical touch is a big thing but I feel uncomfortable touching someone in case they don't like it. What's the best moves a girl can make on a guy and what gives them butterflies?

Updates
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To clarify I don't want him to know I like him until I know he doesn't have a girlfriend. He knows I'm single, he said it to my face.
What is the smoothest way to ask a guy if he is single and what are the best ways to flirt with him?
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