Do girls ever regret not telling a guy how she feels?

Anonymous
Hi, I am a 24 year old guy and have always heard that always show and tell her how you feel, even if you get rejected because at least I will know.
For some reason, girls believe they should never make the first move with a guy.
Do girls ever regret this when the guy moves on with someone else?
Do girls ever regret not telling a guy how she feels?
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