Best thing to do is focus on protecting yourself rather than how to contain your pwBPD’s reaction.

For me, this meant getting the police involved and moving several hours away. I also had to pay two months’ rent to be taken off the lease, as my ex wasn’t working.

I ended up leaving sooner than expected, as he sensed a change and the physical abuse stepped up. Once I’d moved out I called to tell him it was over, on the advice of the police. It’s fine to not break up in person - again, protect yourself.

He told the police I was abusive to him, so be prepared for something similar. The police easily saw through his lies, but I’m very glad I could prove the abuse was one way, for my own peace of mind if nothing else.

Best of luck.