Hi Ammabear,
Welcome to the site. I think here you'll find many parents who are in similar situations. We know how hard it's been, and how frustrating too, because you've tried everything, and yet nothing seems to work. Plus, living with BPD places enormous emotional, financial and physical strain on the entire family, and it can put pressure on your marriage, especially when you don't see eye to eye on what to do. At the same time, parents are usually operating in a FOG of fear, obligation and guilt. The situation is so tense that parents need therapy as much as their pwBPD.
Maybe your son doesn't have a formal BPD diagnosis, as he's young. Many people here don't have a proper diagnosis, and yet many of the behaviors you describe of your son sound like BPD. It's also typical for pwBPD to have co-existing conditions, like ADHD, substance use disorder, addictions, anxiety and depression.
The good news is that your son is very young. With the right therapy and commitment on his part, he could probably turn his life around. The bad news is that right now, he's OK with the status quo, even if he's miserable. He knows that if he has a meltdown, he'll be left alone to do what he wants, which is lie in his bed all day and play videogames. Unfortunately, video games are so compelling these days that it's all he wants to do. I think the female equivalent is scrolling through social media all night, which is what I experienced with the pwBPD in my life. Both situations involve avoiding the stresses of the real world and retreating to a fake one. In the short term, it feels great, because it's easy and fun. But over time, what happens is that they miss out on formative experiences--school/college, work, relationships, independent living, hobbies, working on themselves--that provide purpose, structure and identity-building, which pwBPD need. Deep down they know that, and over time I think they feel increasingly inferior and insecure. The farther "behind" they fall relative to siblings and peers, the worse they feel. To cope, they create a victim narrative and blame others, mainly parents, for all their woes. They'll think, Of course I'm messed up, I had a terrible childhood, it's my parents' fault, they're horrible, I hate them. I think the more they spew hatred and dredge up grievances from childhood, the more frightened they are about the future. They are frightened because they don't really know who they are (except victim), or what they want, let alone how to make it happen. They RESENT you for feeling so dependent on you. And they think, their parents surely think they are a failure, so why not just live up to that expectation?
If there is one takeaway today, it's that BPD is not your fault, no matter how much your dear son tries to convince you otherwise. Blaming you is just a deflection, as well as a way to push your buttons so that he gets concessions out of you (mainly freedom to lie in bed and play videogames). He's also probably projecting his own insecurities onto you. If you want to know what's bugging your son, I'd suggest reading between the lines of his projections. Is he saying, "I'm an adult, I can do what I want, stop treating me like a baby!"? To me that is code for, "I hate feeling like I'm still a little kid and I don't know how to grow up." Is he saying, "You're lazy/ugly/manipulative/narcissistic/selfish, a horrible excuse for a human and you should be euthanized!" That's code for how he thinks about himself.
Anyway, my opinion is that you probably need some boundaries. For me, that would mean that all adults in the home need to be respectful, clean up after themselves and refrain from using illicit substances in the home. In addition, adults can't be NEETT, short for Not in Education, Employment, Training or Therapy. The pwBPD in my life was allowed to be NEETT (and nasty) for far too long in my home in my opinion. She didn't feel the need to work--on herself or to earn any income--because she was content enough rotting in bed. I think young adults should be 100% responsible for paying for their own luxuries, such as phones, computers, streaming services, Amazon account, etc. Unless they are severely handicapped, I think adults should be able to earn some income, for example with dog walking, washing cars, doing yard work, babysitting or something. If your son refuses to do any work, he can choose to go without his own screens, and that would be fine, it's his choice.



... confirming it was never about helping me heal (though luckily I made a copy).