Lavish Marital Lifestyle, How's the Property Divided?

My spouse inherited $18,000,000 before we were married.  He used this money to buy our house and support our 2 children and us in a lavish lifestyle.  While we were married,  my husband started 2 businesses in which he "loaned" his money to.  He would borrow against his large stock holdings and run his businesses from these monies.  Hence, the 2 companies never ( and I mean NEVER) showed a profit and 8 million dollars later - he shows them as worthless yet he still continues to manage them daily (50 employees)  He states on bank documents that he has notes receivable in the amount of $8,000,000 from these loans - but, unbeknown to the bank, they are uncollectable from those businesses.  My husband nor I have ever made enough money through salaries to even cover our mortgage for one month, kid's tuitions or anything else.  We were totally supported by his inheritance after the first 2 years of our marriage.  We have been married 19 years and had no pre-nup.  My BIG question to you is:   Will his inheritance be deemed "separate property"  or will it be "marital" because of the ways he supported the marriage lifestyle with it?  – Ellen