Borderline Personality Disorder is characterised by unstable feelings, sense of identity and mood. Their relationships also tend to be unstable ranging from extreme attraction to a decline in the intensity of such attraction over time. Thus, they may have multiple romantic relationships.
They also tend to have a strong fear of losing the one they love and can go to various lengths to avoid this. They often experience feelings of emptiness and sadness. They may engage in hurting themselves physically when they experience intolerable emotions. Such problems need to be addressed in order to enhance their overall functioning.