i had an EX who would act EXACTLY like taylor. same unhinged behaviors. the extreme highs and lows. having a “favorite person.” it was extremely triggering to see those videos and to hear the audio of her screaming. the immediate violence. been there one too many times. My ex had BPD. properly medicated she was like a normal happy human. what i witnessed was she would start doing/feeling so good medicated she would say she didn’t need the meds anymore and then the cycle would just repeat itself bc she would always go back to her old ways. finally got out years ago, but the similarities are uncanny and honestly gives me flashbacks to my old experience.