How do high school guys flirt? Also how do they act when they are nervous around you?

NotLikeKatniss
Basically I need to know how high school guys flirt when they genuinely like someone. Also how do they act if they are nervous around you? This is because I have a guy friend who acts differently towards me when we are alone and I think he might be flirting with me but when weare with other people he is quite quiet and doesn't really speak to me. He is really nice and funny. He has only ever had one girlfriend before so he isn't a player or a frequent flirter. He is quite sweet and fits in nicely with a lot of different people and he isn't exactly shy-he is actully rather confident.

So I mainly would like to know how the nicer/less abnoxious type of guy flirts and whag signs say that he is nervous around you.

It might also be helpful if you told me how any type of guy-even the outgoing ones-flirts/acts when they're nervous. Thanks :)
How do high school guys flirt? Also how do they act when they are nervous around you?
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