Hi uniquename
I'd like to offer you some support.

From your post, he seems to be in the habit of giving you a lot of problems to deal with and few solutions.
I'd like to maintain a tone of no-judgment on this. Texting a 16D during a suicide gesture, to me, seems highly irresponsible. Putting a young adult into a situation like that and getting her to solve the issue is giving problems to his own daughter. That doesn't seem fair to me. I think few young adults know how to dial a suicide-prevention hotline to get advice. I think few young adults know how to handle an example of extreme behaviour from a parent that is supposed to provide emotional
support amongst other duties. I hope that view on this one example helps. When we are faced with such issues, it's our job as the non-half to respond in a suitable fashion.
I think it's important to explore the question of how you can best look after yourself and any relevant children you are involved with. I think it's important to place that before the "looking after" you may be doing with uBPDh. I don't know what's beyond your post but break-ins and demands seem neither lawful nor healthy ways to go about resolving the issues.
If he seems to be having difficulty with a peaceful and good solution, at least you are in control of your own behaviours and decisions. It sounds like you know how to respond when facing a dysregulation episode--and that dysregulation is sometimes considered a stopper to problem solving with a pwBPD. I hope you can find a peaceful solution to the issues you mention here.
