How do you respond to a catfish?

Let's assume you have been talking to someone for months or maybe even years and you discover that they are not who they say they are. But you have developed a very close relationship with the person they claim to be. Do you confront them and destroy the friendship or allow the ruse to continue as if nothing is wrong?
How do you respond to a catfish?
Yes Daniel. I'm on to you.
How do you respond to a catfish?
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