What’s your procedure when you learn a ‘friend’ of yours has been talking smack about you behind your back?

What’s your procedure when you learn a ‘friend’ of yours has been talking smack about you behind your back?
Just drop the from my life. I dont need that shit
Confront the friend and get them to Try to make it up to you. But if they cross you again drop them
Get revenge on them in some form
Other (say what youd do)
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Had it happen a few times long time ago
What’s your procedure when you learn a ‘friend’ of yours has been talking smack about you behind your back?
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