The ex suddenly changed her avatar or screen name frequently, indicating that she may be upset or excited. First of all, you have broken up with her and become your predecessor. You still have her contact information, and you are paying attention to her. This is your fault. If the incumbent finds out, there will definitely be a quarrel. She frequently changes her screen name, which may be because she is under great pressure recently, or she is in a bad mood for you, or she is chatting with someone recently, constantly changing her avatar and screen name to attract their attention.