Hi there,
From a financial perspective, I guess if I were in your shoes, I'd take control of what I can control. That is, expecting your spouse to cooperate with a long-term, belt-tightening plan probably isn't going to work in practice. My guess is, she might agree in theory to controlling spending, but when the time comes, she'll continue to spend just like she always has. And she'll expect you to contribute and sacrifice today, while her increased contribution will be delayed in the future. And then when the future comes, she'll renege, one way or another--she might argue she never made a deal with you in the first place. Even if you have a written agreement, she'll probably rip it up, or have some sort of meltdown to force you to relent. Is that how things have gone down to date? If so, it's more likely than not that she'll continue to spend carelessly, and not contribute her fair share to the household expenses, no matter how transparent, earnest or reasonable you are. Financial responsibility takes a lot of planning, determination and delayed gratification, and those are traits your spouse just doesn't have. But YOU do.
If that's an accurate portrayal of reality, then what you can control is you. You can make sure the household essentials are covered; anything your spouse ends up contributing is gravy. You can completely cut out non-essential expenses for a time (start with six months), until you get your debt under control. If I were in your shoes, I wouldn't spend any money whatsoever on vacations, restaurants or take-out, except for a very special day like your birthday. Restaurants, convenience foods and travel are wants, not needs, and what you need right now is financial security. If I were in your shoes, I'd also cut out entertainment, such as streaming services. If your wife wants a streaming service, then she can pick up the tab. It doesn't have to be forever. You are prioritizing your financial security over entertainment. In the meantime, you can explore free alternatives, such as checking out books or DVDs from the library, or inviting friends over for a pot-luck/game night, for example.
Given that pwBPD are erratic and prone to meltdowns, I'm not even sure if I would enter into a detailed discussion. I think I'd just do it. I'd stop paying for the streaming/cable service, and when she asks, I'd just state the truth: "I have to reduce expenses because we have a huge amount of debt that's growing, not shrinking, and I can't continue spending on non-essentials." I'd stop going to restaurants and buying take-out; I'd make dinner every night, and pack lunches to take to work. If my spouse insisted on a weekly date night, then I'd cook a special meal, and bring out the candles and cloth napkins. If she insists on a restaurant meal, then she can pay the bill. I'd shop for a cheaper phone/data plan and sign up for it. I'd cancel any subscriptions I'm not using, and explore cheaper options (or pauses) for ones I am using, such as a gym membership.


