A reminder for what is discussed endlessly in this thread is how we all get hooked onto our BPD partners and loved ones, becoming their favorite person and the intensity of these relationships that trap us in our horrific cycles.
A word of advice from my therapist that even professionals fall for: stay off the pedestal. Those of us whose partners are truly borderline: No matter how amazing it feels before the split comes; the overstimulation on their end, getting you out of their life becomes their number one priority. You will get hurt again and again as long as you let them prop you up. Nothing you can do or say will change that unfortunate reality.
For your own sake, you have to break the pattern, you deserve better and you deserve to heal. It's compelling to want things to improve, for many of us their stories are what trap us in structurally abusive situations, but unless they decide on their own to do this hard work we will just keep repeating the same cycles with them.
We're all human, its hard to not fall for the cycles of love bombing, we want the people we love to be okay when they hurt themselves, we want things to stay good, we want the love we give them to be enough, but that's misunderstanding what our loved ones are going through and how it always starts is letting the idealization happen.