If a girl blows you a kiss goodbye, what does it mean?

Alex117
I asked this girl out earlier in the week, and it feels like there's something between us, but she said no because it was kinda a surprise and we're really close as friends, but since then she's been more flirty when tonight she blew me a kiss goodbye after having fun on karaoke and just laughing around with each other. What could the air kiss mean?
If a girl blows you a kiss goodbye, what does it mean?
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