It means you share some of the criteria for Borderline, but not a few majority of the traits.

Take this as example,

A person with this disorder will also often exhibit impulsive behaviors and have a majority of the following symptoms:

Frantic efforts to avoid real or imagined abandonment

A pattern of unstable and intense interpersonal relationships characterized by alternating between extremes of idealization and devaluation

Identity disturbance, such as a significant and persistent unstable self-image or sense of self

Impulsivity in at least two areas that are potentially self-damaging (e.g., spending, sex, substance abuse, reckless driving, binge eating)

Recurrent suicidal behavior, gestures, or threats, or self-mutilating behavior

Emotional instability due to significant reactivity of mood (e.g., intense episodic dysphoria, irritability, or anxiety usually lasting a few hours and only rarely more than a few days)

Chronic feelings of emptiness

Inappropriate, intense anger or difficulty controlling anger (e.g., frequent displays of temper, constant anger, recurrent physical fights)

Transient, stress-related paranoid thoughts or severe dissociative symptoms

If you fit most of these traits, your T would maybe consider you Borderline, but if you don't feel or have no relations to most of these, you only share some traits, but aren't considered fully Borderline.

Maybe talking more to your psychiatrist about this can help too, in case you feel you have a connection.