If your friend told you they cheated on their partner, would you tell their partner?

If your friend told you they cheated on their partner, would you tell their partner?
Updates:
25 d
I'm of the idea of keeping my mouth shut about it since it's none of my business, as long as this person steers clear of me. Or should imply I might let a word out if they don't? But it doesn't seem correct to me to blackmail or threaten someone that way.
25 d
She told me she was cheating on her husband some time ago.
I didn't tell anything nor I will because it's not my business and frankly I don't give a care, but now I see it as a good reason to categorize her as a toxic person and revove her from my life.
If your friend told you they cheated on their partner, would you tell their partner?
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