Well there are different types of flerting!!!
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you can tell if he looks at you alot or when you eat lunch ( this happens to me) he usually sits with his back toward u then he changes his seat to face u!! After a month if he doesn't have a gf, go for it, ask him out!!! You can do it, I know you'll be nervous i know how you feel.... if you want to talk to me only just email me at dblancas805@gmail.com with your name age and I'll give feedback to you asap... just go for it!!!!!
He will be a little nervous around you kind of if he is a shy then he is defiantly kind of having some sort of emotion. He might follow you around a little and what not.
When a man is interested in you, he usually follows you around, calls you non-stop, and looks at you with passion and love.