A friend of yours flirts and has sex with the girlfriend of another friend at a party you organized. How do you react?

That’s unacceptable. Our friendship ends here.
I get angry at him and have a serious discussion with him.
She probably hit on him first and maybe there was already a crisis with her boyfriend/my friend. Who cares I stay friends with everyone
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A friend of yours flirts and has sex with the girlfriend of another friend at a party you organized. How do you react?
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