I have been dating my S/O (23f swbpd) for 3 years and there are a lot of things related to financial stress and poor decisions that have ruled most of our relationship and caused most of our arguments over the years.

Recently, she quit her job to focus on her small business because she got a large business loan and her other job was taking up too much of her time.

I supported this decision because it made sense and I trust that she has the skills to take her business further. However, she has always been very impulsive with money and now she's in a bigger hole than usual with all the business expenses and her poor decisions catching up to her. She has broken down and isn't sure she can do any of it. We are planning on making a budget together and making some decisions relating to boundaries where she sends me money for savings and I keep it in an account under my name for her.

To be honest, the idea of me controlling some of her finances feels wrong. I would never do anything to her money and I am comfortable enough with my income so the financial stress of her decisions isn't taking a huge toll on me this time since I can afford to cover rent and bills if we need it.

But I am wondering if anyone here has a good system for helping themselves/their pwbpd with financial impulsivity? Do you share finances or set strict boundaries? Or both?

Tldr: My so has huge problems with financial impulsivity, exacerbated by running her own business and she wants me to help. It'd be great to hear what others have done regarding this. My so's financial impulsivity is a huge trigger and she goes back and forth between wanting me very involved or just a bit. But at this point we need a system or she will just dig herself into a larger hole.