Borderline Personality Disorder
Borderline personality disorder (BPD) is a serious mental illness that affects how you think, feel, and behave. People with BPD have difficulty regulating their emotions, which causes them to experience negative feelings like anger, anxiety, depression, and guilt more intensely than most. They also have problems keeping their feelings under control and tend to be impulsive in ways that can be harmful to themselves and others.
People with BPD often have intense and unstable relationships with other people. They may idealize someone one day and then quickly switch to seeing them as a villain the next day. This instability in relationships can make it very difficult for people with BPD to maintain healthy relationships with friends or romantic partners.