Hi daverisk,
In my relationship, pwBPD didn't rage, either, although we had a long distance relationship, so don't know if it would have eventually happened. He was more reflective, caring, sensitive. In his own words, he was very uncomfortable expressing anger.
Anger and difficulty controlling anger is part of the
DSM criteria for BPD, but each person is unique, so someone can have BPD/traits and not tick all the boxes.
From the above link:
"Easily bored, they may constantly seek something to do. Individuals with this disorder frequently express inappropriate, intense anger or have difficulty controlling their anger (Criterion 8). They may display extreme sarcasm, enduring bitterness, or verbal outbursts. The anger is often elicited when a caregiver or lover is seen as neglectful, withholding, uncaring, or abandoning."heartandwhole