I'm confused, and scared, as financial worries have long been one of my deep anxieties given family history.
What state do you live in? Things a different from state to state.
My advise is to get a lawyer and talk to them.
I still live with my WAW. I've been DBing for close to 2 years now. In my case, detachment became much easier after I talked to a lawyer. I found out that I wouldn't be destitute if it came to a D. In fact, to stop the financial bleeding, I'd make out on the deal. To change the words on an old song "I never knew DEBT before, then came you".
My WAW is a mom who stays at home (and I worded that quite carefully), from a family where, well lets just say unemployment runs in the family.
I was told (and again, YMMV depending on your state, and length of M) that everything is 50-50 (even the assets I brought into the M) My WAW never worked. In your case, I'm guessing that you would split everything, including the debt.
Just because you cover you ass-ets doesn't mean you have to file nor does it mean you can't DB.
As for credit cards, I can steal your wallet if you like, or perhaps you just loose it. Ask WAW if you left it there.
After a few days, just cancel all the cards and ask WAW what you should do about replacements.