My ex-girlfriend who broke up 4 years ago suddenly sent me a text message saying I’m sorry. What does it mean?

Hello, it has been four years since we broke up and there is no reason to continue. Maybe she has been in contact with many people and found that they are not as good as you. Maybe she is hurt and wants to seek comfort. But once it has passed, it will never go back to the way it was before. Sometimes if you miss it, it's forever. It’s also very hypocritical to think of you only after four years