What would you do if you knew your best friend was being unfaithful to their significant other?

Would you tell their SO or stay out of it?

I'd tell their significant other
I'd stay out of it, their relationship is none of my business
I'd do something else
*shrugs*
Select gender and age to cast your vote:
What would you do if you knew your best friend was being unfaithful to their significant other?
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