Business owner

Does anyone out there have experience with spouse having a business and keeping ALL information, money, everything from you. I am separated from a man that has NEVER included me on the details of our income. Never had any money in the bank, yet can pay cash for high dollar cars and whatever else he wanted. Yet I never knew where the $$ came from(wonder why we are divorcing). I need quidance of what to look for and any information would be helpful.