This is what I did but I was absolutely planning to leave (and did), it wasn't just about having an option so I'm not sure if it is relevant but anyway, that is the disclaimer.

xDP had a well paying job, we lived very comfortably and I was staying home full time with DD. We had built substantial savings (it was for a house deposit) in an account entirely in his name that I had to walk away from so I understand completely how it can feel to have given up your financial independance. He then had an account which was for day to day expenses (usually sat around $5000) which I had access to but it wasn't in both our names either.

For about 2 months before, I took a couple of hundred each week out by withdrawing a small amount each day so that it wasn't too obvious. DP was quite controlling so I didn't want to alert him to anything until I was ready to make my move. On the day that I left, I took out the daily limit which was $800 so all up I had around $2500, DP had my card cancelled that next day which is what I was expecting. I went straight to centrelink and began the process of applying for payments, they took a couple of weeks to begin but were backdated to my first contact with them. I was then lucky enough to be able to stay with my parents for a few months (so with very few expenses) to start building up enough savings to make a new home.

I left while he was at work and I took everything I felt I could but obviously there were gaps that needed filling (toaster was one thing I bought almost straight away lol but other things, like a TV, I never bothered replacing so we didn't have one until we moved in with now DP about 18 months later) and it was a little rough at first. We lived very basic in a tiny one bedroom place, we walked almost everywhere. Funny enough, now that I have more financial freedom with my new partner, we still live in a tiny place with a huge yard, we still walk almost everywhere and I love all the basic ways of living I established in that time of neccesity haha. You will be surprised all the things you don't really need when you have to make every dollar count