My ex-girlfriend suddenly sent me this screenshot, and I don't know what it means because she likes me ... I broke up with her.

This is obviously because she is heartbroken for you. Are there any other women around you? She is a weak woman, without much scheming, but she is brave and a good woman. When you broke up with her, she was giving you a summary, like a movie, which was the end of the story! Although everything is over, she still loves you so much, but she feels her own strength, not so strong, so this is a last resort and an unwanted ending. That's it, very simple, very frank, very straightforward!