Should you ever actually tell a girl she broke your heart?

I've heard back and forth...upfront honesty if the situation arises, or just playing it off and am not sure which really is better. You wouldn't just randomly say "you broke my heart" of course, it would be more like if you found yourselves talking alone or maybe she noticed you act quiet/reserved around her, much different than before.

Feel free to apply it to both girls and guys
Should you ever actually tell a girl she broke your heart?
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