Today, my girlfriend lost the ring I gave her. I lost it when I said I lost it. I'll buy you a real one later. What should I do if she is angry?

Hehe, it's okay. Comfort her well. She is angry because she thinks what you said is too casual through what you said, because she values the ring, not the price, but the value, which is of great significance. But your words make her feel that you don't care about the existence of the ring, so she may be a little disappointed. She is angry and expects you to comfort her, an unexpected supplement, but her feelings are dribs and drabs. Don't let her do it again.