when I stared at a girl for a long time it usually means I want to say somehting, or I want to kiss her. I'm usually a pretty shy guy so it takes me a while to spit it out. :P sometimes when I'm looking at a girl I'm just thinkg, "wow, she's so amazing," or I think I really like her type of thing. guys do think about a lot of things. and when we stare at you it usually means we like you, or are at least attracted to you. and maybe we are unable to talk to you so we comunicate through our eyes. try to look for signals that maybe they want to kiss you or osmehting.