i'm not flirty. it turns out that all these "subtle signals" i've been trying to give guys for years are only interpreted as being nice! so maybe that's it.

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id say thats most likely it. you dont have to be "flirty" to flirt. its actually better if your not cause wen u do they get the point.

only other thing i could think of but i dont no for sure caus ei dont no you but... confidence mabye?

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And don't assume a guy is not into you.

This is how a guy's brain works, step by step: At every step a girl can be eliminated from a guy's mind. But if she passes the step, the girl stays on the guy's mind.
1: Sees a girl.
2: Checks her out. (Only looks matter at this stage. A lot of girls are gone by here)
3: Looks at if she's approachable (Best if she's alone, but 1 girl with her will work too if the guy is very confident)
4: Tries to start a conversation (If you are assuming the guy is into you at this point, you'll have a better chance of keeping his interest)
And if you think you don't know if the guy is interested or not, it's waaaay worse for the guy to know if the girl is really interested or not. If you are interested, and the guy is about to leave without asking for your number, the best thing you can do is write your number on a piece of paper and give it to him.

and as a rule heres what most girls do if they are interested:

1) keeps eyes contact
2) smiling, laughing
3) move closer to you/ touch you on the arm or something

basically flirting...