I've been through breakups before and have never felt or dealt with anything like this.
May I add my welcome too. We've all been through this and it is truly heartbreaking - and utterly impossible to explain to those who've never experienced it. Please try to avoid feeling guilt, as it drains you both physically and mentally. You did your best and nobody can do more. You're the only one who can take care of your own welfare so prioritise yourself.
With a BPD partner you're playing a game where you have codes of conduct, rules and logic. Your partner has none of these and everything in their own mind is always 'the truth' and they are 'the victim'. It's a battle where you can - at best - only hope for a temporary cease-fire but you will never win the war.
I'll post again the 'Three C's'.. you didn't Cause their BPD, you can't Control it and you can't Cure it. Go easy on yourself.




line alone would have decided it for me. Threats are a no-no.