What if you found out your SO was a murderer? (Read description)

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What would you do if you found out your SO was a murderer? BUT they only kill bad guys (murderers, child molesters, rapists, etc).

I'm watching Dexter and his psycho ex just found out he's a murderer by finding someone who knew his crimes so I was wondering what everyone here would do.

Bonus question (answer in the comments): Would you let your SO know you knew or keep quiet?

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