How do you know a girl regrets rejecting you?

Guys: What are some observations you've noticed that a girl regrets rejecting you? Did they ever approach you? Girls: have you ever rejected a guy that approached you and later on regretted it? What did you do? Do you wish the guy re-approached you? What are signs that a girl regrets rejecting you?
How do you know a girl regrets rejecting you?
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