My best friend is talking about showing off her "good friend" every day, saying that she will always be a good friend. How should I reply to her?

Just like three monks carrying water to eat, there must be two of them who are the best. Your best friend may be a little dissatisfied with what you do, so she always shows her relationship with the other person. If she really cared about her feelings with you, she would never do that. Don't worry about such a best friend, but don't offend her, because she may hurt you. She showed it to you on purpose. Don't reply. Let her show it. Not talking is the best answer for your reference.