Girls, What signs do you give out if you're interested in a guy?

Hey girls just wondering if you give out any signs at all? I'm a bit of an introvert and shy and don't like approaching women cause I'm always worried about getting rejected. Last week I had girl interested in me ( I only found out after she left my city ) , however I was intimidated by her cause she just looked disinterested and just looked unhappy but apparently that was just her normal persona
Girls, What signs do you give out if you're interested in a guy?
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