As of that time, there were no public statements or credible sources confirming that Taylor Swift has borderline personality disorder.
It's essential to be cautious when discussing someone's mental health, as it's a private matter and should be treated with respect and sensitivity. Diagnosing mental health conditions can only be done by qualified mental health professionals who have personally evaluated the individual in question. Speculating about someone's mental health without proper information can perpetuate stigmas and misunderstandings about mental health issues.
Remember that celebrities are entitled to their privacy, including their mental health status. It is best not to assume or spread unverified information about anyone's mental health. Instead, let's focus on appreciating their talents and respecting their personal boundaries.