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How am I suppose to know if she knows I like her?
it's likely she knows, no point in you trying to find out if she knows
if you're oblivious to her level of interest, you should flirt with her and build compliance, see how compliant she is, if you got compliance she probably likes you back
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Is it just because I talk to her at length?
people give themselves away with everything they do, body language, voice tone, language, the actions they take, and how they treat you/act around you
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I haven't assumed she likes me. Why wouldn't it be the same for her?
well that's not a good sign, are you just bad at reading body language? or just positive she doesn't like you? it's usually not that hard to tell
why wouldn't it be the same for her?, well, it's seriously just not that difficult to tell when someone is into you, why would a person of the opposite sex approach you to begin with if their interest was not sexual?, 9/10 times a guy approaching a girl has nothing to do with him just wanting to ''just start a casual conversation about nothing'' or ''be friends'' even if that is how he acts, girls are not stupid, they are very wise to this fact if they have been dating for more then a couple years, but they play dumb and friend zone those guys cause they are not willing to put in the effort to take the responsibility and often find this sort of thing boring, it's a turn off to most