Hi endingthechaos,

More than anything, I feel awful that this person doesn't seem to know how sick he is. He is in crisis mode most of the time and for a while I just viewed him as misunderstood. I had no idea what borderline personality disorder was until about 2 years ago when he went away for DBT therapy. But, since he doesn't believe he has BPD he hasn't continued it. It's the moments that he doesn't act sick that I miss. I have cut off contact with him and I'm trying to stay strong, but I am so angry that this is who he is forever.
I'd like to welcome you to the family, I'm glad that you have found us.
Think of it this way, his reality is real to him just as your reality is real to you, he doesn't have something else to use as for a benchmark.
We don't know that he is going to be this way forever, he may get help further down the road or he may not, that anger that you're feelings is partly because of not accepting him for who he is, he is who is, I'll give you a link to radical acceptance, basically it's accepting something or someone to get ourselves unstuck, it's really helpful, it helped me accept two people in my life that have a mental illness, my ex wife and my dad.
Radical Acceptance For Family Members (DBT skill)