Once you've turned your back on someone, don't go back again.

Because the true nature of human nature will be fully revealed at the moment of turning face.

Turning face is not a momentary impulse, but a reflection of the other person's long-held true thoughts. It means that both parties no longer pretend, and are unwilling to pretend anymore.

Already prepared to part ways, don't think there's any old affection left. In this situation, just turn around and walk away.

Treat this relationship as a lesson, rather than continuing to drain yourself.

If you choose to forgive, then it can only be said that many people's misfortunes are caused by their own stupidity.

Actually, there are exceptions.

For example, Elon Musk and Donald Trump have "multiple face-turnings," but their relationship is still good for now, and they recently had dinner together and attended Trump's family gathering.

This kind of "face-turning" is most likely just differences in government views and decisions, but in personal relationships, there hasn't been a real falling out, so!