Soon to be Ex and Banking Issues

I owned my own company when my husband and I married. When I added him to my business we opened a new checking account. I was working so I had him set up the bank account. I thought he set the account up as a joint account. But when he knew that I was leaving he took my name off the account. I found out that it was a sole proprietor account when my bank card didnt work and I called the bank. I had already deposited client funds into the business account on April 20. I have the deposit slips to prove this. He wrote a check for 2,027.00 to Lowes Hardware for items to be used for the client on April 21. However, what he did wrong was decide that he would pay his house payment on April 22, out of the funds before the check cleared. He then expected me to give him more money to cover that check. He is now taking me to court for the $2,027.00. Am I responsible in anyway for this check. His name was on the bank account as sole owner, and on the check and he signed the check. HELP PLEASE