well, if he starts looking at you, then he is kinda flirting. and if he starts to talk to you 24/7 and he usually doesnt, then u know something is up! Plus, if he asks for your number and you like...
the boy sign is a circle and an arrow pointing up and diagonal, while the girls sign points down diagonal with an arrow but its more cross-like. hope this helped!! :]
It's not easy..... to tell if some-one's flirting but good thing i'm answering to tell someone is flirting let's say a guy is talking to a girl he might either try to say she's sexy or hot then next...