Is smiling at your crush a sign of interest?

Is you or your crush making eye contact and smiling at one another flirting or a sign of interest?

For a little while, all me and my crush really did was make eye contact and smile at each other when we saw each other, before we got to talking. At least the first couple times, i think she thought that i liked her, based off her reactions. She is the shy, introverted type, as am i.

Is smiling at your crush a sign of interest?
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