Please remind me why we deal with our significant others who can't really function emotionally. Most days I can't believe I ended up in this place and I can't see the upside for me. Right now, my life with him seems completely ridiculous and so not something I would normally put up with.
This is definitely a hard question to answer, but my mind dictates that "if we are willing to put up with it at all, there must be a reason, right?" In my case, when my uBPDw is her normal self, even when the environment is fairly neutral, I am constantly reminded of the things I love about her. Her drive, her passions, her dedication to her dreams, and really, just how unlike anyone else I've ever met she is. At her worst, she can be verbally and emotionally abusive, manipulative, and unreasonable. At her best, though, she is supportive, caring, hard-working, sexy, and I am reminded that she does, in fact, love me.
I have often found myself saying "how did I end up in this position?" And it's difficult to think about, difficult to walk through life resenting the people I see around me whose lives and relationships seem so pure and uncomplicated, so blissful., and harder to know I may never attain that. I believe everything is the way it is for a reason, though, and perhaps thinking in such a way is a solid push to being a more confident, more self-caring person.
I may be rambling a bit, but I found much to relate to in your words and if I can offer anything, it's to try your best to maintain your own physical, mental, and emotional health, and stay confident. Be vigilant in the things you want and even more so in the things you need.
Lastly, keep coming back here. Not only has it helped me feel a sense of community and understanding when I need it most, it has also given me an opportunity to explore the reasons why I stay. Sometimes typing these things out, be it a concrete list of the "good and bad" or what we need to do (as hard as our own advice can be to follow in the moment), it's good to have those reminders on paper.
A tip I received from my therapist is to "grade" our interactions daily, so I can stay grounded. I can know that it can be good when it's bad and vice versa. Keeps me out of "la la land" and helps me think clearly about the state of things. I basically just keep a sheet of ratings 1-5, worst to best, on how our daily interactions are and how I felt by the end of the day.