Four years is enough time for a person to grow a lot. Maybe the reason for breaking up before is that you look back now, some feel pity and some feel childish. I have a buddy who has been married to his current wife for six years and has a four-year-old child, but one day he found his first love in high school in someone else's space in QQ space. It has been ten years since we broke up. My buddy told me that he had been looking for her for ten years and had no contact since he graduated from high school. I asked you what you want from your child now that she is so old, and he simply told me that I want to know how she is, as long as she is doing well ... So I think your ex came to see you, and your feelings depend on why you broke up. Now you're sad? Or are you sorry? What you can't get is always in turmoil ... Cherish the present.