How to reply to my girlfriend that she is fat?

Hello, if your girlfriend says he is fat, you must never say he is fat, because he will feel particularly uncomfortable if you say he is fat. When he said I was fat, you said you were the best and most beautiful in my heart, but I didn't think you were fat. I have always liked you, whether you are fat or thin, I can accept you, and I think you are beautiful, so that your girlfriend will feel very happy after listening to what you say.