I just broke up with my boyfriend and sent a circle of friends to say that WeChat doesn't need to change its number. What is the psychology, and then

That depends on the situation when we break up. If it is an affair, then he may just want to get out of your life. If not, it's because he is naive and thinks that he can forget you by deleting his account. I suggest that you don't dwell on the past and have no illusions about getting back together, because the probability of getting back together after breaking up is above% 70, and the probability of finally being together is lower than% 3. At this age, you should try to improve yourself without knowing what's going on.