if a girl gives you her number that's cool, if she gives you a fake one who cares, it's not that big of a loss considering she wasn't even into you. if you are honestly hurt by that then you need to relax your ego.
also i like how everyone in here instantly just starts talking about girls doing it, nice sexism guys.
Well... I was referring to girls giving out fake numbers for two reasons: one because I am male, and two because guys don't typically do this... it's not sexism, it's just the way it is... guys are typically not as worried about hurting someone's feelings.
And I agree, it's not a big loss if a girl you just met gives you a fake number, but if she's talking to you and "pretending" interested enough to give you a number at all, she should either give you her real number or tell you she's not interested... it's not an ego thing, it's a matter of respect and honesty... is you are giving out fake numbers, chances are you're pretty fake yourself