Splitting is a primitive defense mechanism that borderlines routinely enact when they are triggered by events/emotions in the here and now that threaten their feeling anything to do with their original core wound of abandonment and the intrapsychic trauma associated with that abandonment.
Ending a Relationship With Someone With BPD – Contact or No Contact? – Nons
Ending a relationship with someone with Borderline Personality Disorder means having to figure out what to do about having contact or going no contact.