Anybody's BDP partner repeatedly cheated being impulsive? How did they stop?

Being in a relationship where your partner has Borderline Personality Disorder (BPD) and struggles with impulsivity, especially around cheating, can be incredibly painful and confusing. It sounds like you're dealing with a lot of emotional weight, and I want to acknowledge the courage it takes to talk about this. Impulsivity is a known symptom of BPD, and for some, it can show up as risky behavior, including infidelity. But it’s important to remember that while BPD can explain behavior, it doesn’t excuse the hurt it causes. Have you had a chance to talk openly with your partner about how their actions have affected you? Some people with BPD can work through these patterns with consistent therapy, especially Dialectical Behavior Therapy (DBT). Healing is possible, but it takes deep commitment and honesty from both sides. You might want to communicate about this with your partner.

It sounds like you are trying to make sense of something very painful, and that is completely understandable. When a partner acts impulsively and breaks trust, it can leave you feeling confused, hurt, and unsure about what any of it means. People who struggle with impulsive behaviors often have difficulty slowing down their reactions in the moment, especially when emotions feel intense or overwhelming for them. That does not excuse the behavior, but it can help explain why it keeps happening even when they say they regret it afterward. There is no single path that guarantees change, but many people begin to shift their patterns when they learn healthier ways to cope with strong emotions, communicate honestly, and create structure in their relationships. Sometimes small steps like setting clear boundaries, pausing during emotional moments, or working on emotional regulation skills can help them move toward more stable behavior. Your feelings about this experience matter, and reaching out to understand it shows a lot of strength on your part.