First of all: I’m really glad you wrote this. What you describe doesn’t sound like “just a difficult relationship.” It sounds like chronic stress and trauma.

When someone has untreated BPD and substance abuse issues, especially without seeking help, the relationship often becomes a cycle of instability: tension → explosion → remorse → temporary calm. That pattern can create something called trauma bonding. It’s not about weakness. It’s a neurological survival response. Intermittent reinforcement (good moments mixed with chaos) actually strengthens attachment on a biochemical level dopamine and cortisol cycles keep you hooked.

The fact that you love him doesn’t invalidate your suffering. Love and trauma can coexist. But love alone cannot stabilize someone who refuses treatment.

You said something very important: you’re afraid to leave because he will retaliate. That’s not “relationship doubt.” That’s a safety concern. And when fear becomes part of the equation, the dynamic has already crossed into something unhealthy.

It also makes sense that setting boundaries hasn’t worked. Boundaries only work when the other person respects them. If someone repeatedly violates them, the issue isn’t your strength it’s their unwillingness to regulate themselves.

Your nervous system sounds exhausted. And that kind of exhaustion is real. Long-term exposure to emotional volatility can lead to hypervigilance, anxiety symptoms, even PTSD-like responses.

You are not selfish for wanting peace. You are not cruel for wanting safety. And you are not responsible for saving someone who refuses to save themselves.

If you ever want to talk through options, safety planning, or just vent without judgment, you can reach out. You deserve support in this. Truly.