My ex-girlfriend had a date and sent me a message arguing about who was right and who was wrong in the past, saying that she was very angry when she thought of me. What does she mean?

This behavior of your ex-girlfriend makes me think he is stingy and narrow-minded. Obviously, you have broken up and separated, and now he is seeing someone. If he is still bargaining with you, it will tell us a lot. She is stingy and narrow-minded. In fact, I don't think you need to contact him again if your rights are like this. All contact information can be blacked out, deleted and so on. There is no need to care too much.