How would a girl know if a boy is flirting or trying to flirt with her?

if he is ignoring herHow would a girl know if a boy is flirting or trying to flirt with her?
If a girl cannot distinguish between being flirted with or not, then she is a moron! blond maybe?How would a girl know if a boy is flirting or trying to flirt with her?
is he coming on to you?
If he is paying attention to you in anyway, thats flirting.
usually when a boy flirts he may give you physical gestures like touching your hand or rubbing your shoulder and he may compliment you more than the usual person and just kid around with you alot and also make gestures to you like ';if i was your boyfriend...';