Django的ManyToManyField自动在对象之间添加对称关系

I am trying to code a model that holds a list of references to other objects of the same class. I am using a ManyToManyField to store those references. For some reason when I add an element to the many-to-many field of a second element I get a reciprocal relation added to the first one.I am trying to code a model that holds a list o