Hi VigilantHylian
Welcome.
Yes, a family that is manipulative and exploitative may contribute to BPD traits and anxiety. Again, you're right in seeing that it's difficult for a partner with anxiety to help another with anxiety. I appreciate that difficulty. On my less-than-ideal days, it took even more effort to manage my own partner—so of course it's not easy.
Full time work is usually a step in the right direction for many adults. Would you mind sharing what it means to be a bit much for her to deal with?
It seems to start over nothing, but eventually boils down to her becoming cold towards me, shut off, and suicidal. Most conversations are negative or depressing, and it doesn't seem to get better. I am always trying to remain calm, and do my best to just be there for her but it often ends in screaming or her throwing things, or just a complete suicide mindset that is almost impossible to shake.
I understand this is very difficult. Many of my "arguments" with my ex will follow the path you described. I suggest you look at this first:
https://bpdfamily.com/content/triggering-and-mindfulness-and-wise-mindThen this:
https://bpdfamily.com/content/communication-skills-dont-be-invalidatingSometimes pwBPDs have great amounts of anxiety that results in a lot of pain. This is similar to your description of an unending lack of safety. That there's always something wrong.
Many of the members here are logically inclined. I encourage you to have hope that the situation can be improved.