An unstable sense of self is characteristic of the disorder, along with impulsiveness and demanding behavior.
Substance abuse and promiscuity are also common, and may be connected.
When something goes wrong in their relationships, they do not respond in a manner that would repair the damage.
By doing so, they limit others from being able to fully cooperate in return.
Individuals with BPD may feel that their emotional needs are not met in a relationship, but they do not have the capacity to assert their emotional needs in a productive and healthy manner.