People with BPD tend to have relationships that are intense and short-lived. You may fall in love quickly, believing that each new person is the one who will make you feel whole, only to be quickly disappointed. Your relationships either seem perfect or horrible, without any middle ground. Your lovers, friends, or family members may feel like they have emotional whiplash as a result of your rapid swings from idealization to devaluation, anger, and hate.HelpGuide.org
A pattern of intense and unstable relationships with family, friends, and loved ones, often swinging from extreme closeness and love (idealization) to extreme dislike or anger (devaluation).NIMH
A pattern of unstable intense relationships, such as idealizing someone one moment and then suddenly believing the person doesn’t care enough or is cruel.Mayo Clinic
Unstable personal relationships that alternate between idealization (“I’m so in love!”) and devaluation (“I hate her”). This is also sometimes known as “splitting.”NAMI
This is one of nine symptoms used to diagnose borderline personality disorder. Many of these symptoms are common to other disorders and you should seek professional guidance if you are concerned about a diagnosis.