How do you know if a naturally flirty girl genuinely likes you?

Anonymous
This girl at my work is naturally flirty. She flirts with all the guys but she has never hooked up with any of them. When she flirts with me everyone says she does it because she genuinely likes me, not just because she's a natural flirt. Apparently there's a difference when she flirts with the rest of the guys and when she flirts with me. I would tell you the difference but I don't even see it myself?

1. What behavior (s) should I look out for to see if this naturally flirty girl genuinely likes me?

2. Is it harder for girls who naturally flirt with everyone to genuinely like someone?
How do you know if a naturally flirty girl genuinely likes you?
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