I am afraid that when it comes to personality disorders, people will feel both strange and fearful, and some people even equate it with “neurosis”. In fact, personality disorders are not that scary, and are a very common type of psychological disorder. Our common personality disorders can be divided into eight types, namely paranoid personality disorder, antisocial personality disorder, borderline personality disorder, performance personality disorder, narcissistic personality disorder, avoidant personality disorder, dependent personality disorder and obsessive-compulsive personality disorder. Of these, borderline personality disorder is the most widespread type of psychological disorder that exists in interpersonal interactions. These people make friends by the simple rule of “either good or bad”. Xiao Zhang is one of the representatives, at first, she thought that the dormitory with Xiao Li only good, no shortcomings. So she and Li became good friends, and in life, study are very dependent on her. However, one day Zhang suddenly found out that Xiao Li also has shortcomings, and began to alienate Xiao Li. This happened a few more times, and everyone felt that Xiao Zhang was always cold and hot with people, so it was hard to keep a good relationship. People like Xiao Zhang are likely to have borderline personality disorder, their relationships are very unstable and insecure, their moods are very volatile, either they think their friends are perfect or they stay away from others after finding out their flaws. Psychologically, this is due to the neglect they received from their caregivers, especially their mothers, as children, which led them to blame themselves for the neglect. At an early age, they come to the conclusion that they are bad children, so they are not loved by their mothers; and that those siblings or children who are favored are good children. This results in their perception that there is no middle ground, that people are only good or bad, and that things are only black or white, leaving no room for maneuvering for themselves and others. We can see that, subconsciously, they are at a loss for the complexity of the real world, and always want to maintain their own inner worldview of simplicity. Once they find an intermediate state, they will adopt a distant and avoiding attitude. If a friend is found to have this type of problem, it is recommended that family members should first take them to seek professional psychotherapy. At the same time, mothers should care more for their children unconditionally so that they can experience that they are not neglected.