Guys you ever regret not giving a girl a chance?

that one girl that got away, you had her right there she liked u, she was nice to u, your talks were cute, and you didn't want her. ever beat yourself about it later? why does this happen? this guy contacted me out of the blue saying he's sorry for what he did and misses me but I don't know if I should even trust him.
Guys you ever regret not giving a girl a chance?
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