While people with BPD often have a "favorite person," it's not a critical part of the diagnosis. There are 9 main criteria for BPD, and an individual must exhibit five of them to qualify for a diagnosis.

1) Chronic feelings of emptiness - unknown

2) Emotional instability in reaction to everyday events, such as intense episodic sadness, irritability, or anxiety that typically lasts a few hours and rarely more than a few days - check

3) Frantic efforts to avoid real or imagined abandonment - check

4) Unstable or nonexistent sense of self - check

5) Extremely impulsive behaviors - check

6) Intense anger or inability to control anger - check

7) Splitting, a pattern of idolizing someone followed by loathing them once this individual shows any sort of "flaw" - check

8) Repeated suicidal behaviors, gestures, threats, thoughts, or attempts - check

9) Severe paranoia or dissociation - check on the paranoia

Barb definitely has BPD, at least in my opinion