DSM-5 Criterion 2
A pattern of intense, volatile relationships that swing between adoration and contempt — driven not by the other person's behavior, but by the emotional lens through which they're seen.
Relationships in BPD tend to be intense from the start. The connection feels electric, immediate, destined. The new person is idealized — perfect, the answer to everything, the one who finally understands. This isn't ordinary infatuation. It's a desperate hope that this person will fill the void, quiet the fear, and prove once and for all that the person with BPD is worthy of love.
But no human being can sustain idealization. Eventually, the other person does something imperfect — cancels a plan, says the wrong thing, fails to read a mood. And in BPD, that imperfection doesn't land as a minor disappointment. It lands as a betrayal. The person who was everything becomes the person who can't be trusted. This is devaluation, and the shift can happen in minutes.
The pattern repeats across relationships — romantic, platonic, familial, therapeutic. Each new connection starts with the same intensity and hope, progresses through the same cycle of idealization and devaluation, and often ends with the same devastation. The person with BPD is left confirming their deepest fear: that they destroy everything they touch.
New relationships move fast — emotionally, physically, in terms of commitment. The person with BPD may share their deepest secrets on a first date, say “I love you” within weeks, or want to spend every moment together. This intensity feels wonderful to both people at first, but it sets an unsustainable pace.
When devaluation hits, the shift is disorienting for everyone. The partner who was adored yesterday is now viewed with suspicion or contempt. The friend who was a soulmate last week is now seen as fake or disloyal. The person with BPD genuinely experiences the other person differently — this isn't an act.
People on the receiving end describe it as whiplash. They can't figure out what they did wrong. They walk on eggshells, trying to stay in the “good” category. The person with BPD is equally confused — they don't understand why their feelings keep changing, and the instability itself becomes a source of shame.
When relationships end — and in BPD, they end frequently — the grief is catastrophic. It's not just losing a person; it's losing the hope that person represented. Each failed relationship adds evidence to the belief that connection is impossible, that love always ends in destruction.
DBT's interpersonal effectiveness module is designed specifically for this. It teaches skills like DEAR MAN (asking for what you need clearly), GIVE (maintaining the relationship), and FAST (maintaining self-respect). These replace the desperate, destructive patterns with approaches that actually work.
Equally important, mindfulness training helps the person recognize when they're splitting — seeing someone as all good or all bad — and practice staying in the gray. “Walking the middle path” means holding two truths at once: this person disappointed me AND they still love me.