How would you act if you were afraid that a certain person could reveal a secret of yours?

If you had a suspicion that someone you’re not too close with found out a secret about you that would definitely harm your reputation, career or personal relationships with other people for instance that you cheated on your phd thesis or your partner, that you slept your way to the top etc. Would you try to intimidate or tease/mock them in some way? Or would you try to dig up dirt on them, follow them around etc. How would you act and how would you try to find out if she knows about your secret?

How would you act if you were afraid that a certain person could reveal a secret of yours?
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