What do you if someone tells you their dark secret?

What do you if someone tells you their dark secret?
Do you keep it? Or you go and share it around?
Keep in mind that this person told you because they wholeheartedly trust you.
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You have all shared a whole lot of beautiful and diverse opinions, thank you!
I'm sorry I couldn't reply to all of them, but I've read all of them and I really enjoyed reading them!
What do you if someone tells you their dark secret?
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