Good for you, smileX!!! Everything you said is true.
This is not a board for people in dysfunctional relationships with dysfunctional people who are undiagnosed and their bitter partners and ex-partners.
I know how hard it is to "come out" when you have borderline. The diagnosis is so misunderstood (this board is proof of that). I want the borderlines to feel safe posting here. I don't know why the others don't take their relationship problems to "Divorce" or "Relationship."
But I do know. They THINK they had a borderline ex, they THINK they are the healthy ones, yet they come to this board to lash out at those who are mentally ill ASSUMING that they are like their ex's. I wonder if they realize they are bullying mentally ill people, but I don't really care. It's meanspirited.
I have been told by the mods to let them know if this kind of nonsense goes on here. These posts have NOTHING to do with borderline and everything to do with a person's diagnosis of an abusive ex, if the stories are being presented honestly. They are meant to hurt us.
To counteract some of what is being assumed as borderline, I am diagnosed. I am quite a sensitive person (overly sensitive, but getting better every day) and have never been in trouble with the law, never stalked anyone, never cheated. My abuse was to myself mostly and I lashed out angrily when I felt threatened or abandoned. This does not mean I didn't feel bad about it. I apologized (nobody better tell me I didn't) and felt deep remorse, even suicidal. So I'm not sure what this SO had, but it could be anything including he is/was a substance abuser who was out of control for that reason alone.
Truly, I am shocked at the ignorance out there about borderline, and am not surprised borderlines are afraid to ask for help. But, guys, it's getting so much better.

The psychiatric community has revised treatment of borderline and find it quite treatable. Remember that once autism was seen as schizophrenic and that was proven wrong. They were wrong about borderline too, which by the way may be changed to Emotional Dysregulation Disorder in the DSM.
That's really what it is. Many borderlines remit on their own, even without treatment. THERE IS HOPE! The worst part about it is people who are reading old material or who simply think they get it, but don't have a clue. Have a great day and keep your chin up. You're a good, worthwhile person fighting a nasty mental illness. But it can be done!