
It is not unusual for the non to have more concern for their person with BPD (pwBPD). We have been conditioned to think that way after all. All of the storms and good and bad that you mentioned are part of the process that conditions us to think like that.
The good news is that what has been taught can be untaught. You can learn to take care of yourself first; in fact you need to. Whether or not you decide to try to save your marriage, taking care of yourself is going to be your number 1 job.
None of us can answer whether or not you should stay or walk. That is a personal decision that each of us must make. There are some article about
saving a relationship that is in or near breakup that will provide you with some useful insight.
Also, in the sidebar to the right are tools that will be invaluable to your navigating your situation going forward. The one about ending conflict is a really great place to start.
Has your wife been diagnosed with BPD?