Borderline Personality Disorder Splitting is a growing concern because of its severity and symptoms. Splitting is a term coined for seeing things as all good or as all bad. BPD is a severe form of mental illness characterised by a pattern of mood swings, impulsive actions and problems with relationships. Splitting is sometimes referred to as black or white. It is challenging for the family or friend to control the erratic behaviour of the patient. It can be exhausting, challenging, confusing and also disturbing. People should not be ashamed of consulting a doctor if they have a mental disorder. They must remember they are not alone.