i had a towing company which was a reg llc company in pa,after a divorce with the co owner we closed the co. down,am i responable for the co. debit?

In general, unless you have agreed in writing to be liable for the debts of another, you are not and cannot be held liable for those debts. While there are some limited exceptions to this rule, your inquiry does not provide any facts that would provide a basis for circumventing this basic rule.