Obviously, your first immediate need is to get some cashflow so that you can get to the next step.
Take a look at your wallet. Do you have ANY credit cards that he is SOLELY responsible for (his card, you as a user)?? Use HIS cards to buy clothes, groceries, pay the bills, etc. If possible, get CASH from his cards, as much as you can as often as you can. Do as many transactions as needed to MAX out HIS cards. Do not do this with cards that you have any responsibility for, since they will surely come back on you.
Make sure that you contact ALL credit cards that YOU are responsible for and CLOSE those accounts.
Also, if you have a bank account, go there NOW and cash a check for the full remaining balance. Then, look through your checkbook and contact anyone that YOU wrote checks to. Advise them that "due to circumstances beyond you control", you had to close that account and that you will be glad to 'buyback' the check with cash. You do NOT want to leave yourself in a situation where you have additional problems. Do NOT buy back any of HIS checks.
Then, after you have some cash and groceries, gas, etc. you can determine your next options.