If you properly registered your business in your name only and properly opened accounts in your Business name, with you as the only signature, then he will have not standing to assert that you stole from your own business, since you will have had authority to dole out draw/pay for yourself.
So first, you need to collect all of your documentation and keep them secured. I suggest a bank safety deposit box. Moreover, if he ordered supplies without authority or otherwise pretended to be you when he did it - he could be guilty of identity theft or could be otherwise liable for the cost of those supplies, unless later agreed to pay him for them.
Good luck with your new business and your new future. I am very happy for you and I suspect that you are making a good move, given the fact that he is seeking to criminalize you because you are leaving him, as per your facts.
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