Why does chatting with your ex produce a strong sense of disgust?

Why does chatting with your ex produce a strong sense of disgust? This is because she did too well in the past, which hurt your feelings and left you a very unpleasant impression. In this case, there is no need to contact again now. Why waste time chatting? Let bygones be bygones. You can cheer up, try to improve your ability, make yourself excellent and meet a better tomorrow.