If my STBX wife racked up credit card and other debt after our separation date, am I responsible for that debt?

Moved out 1 year ago, which was our agreed date of separation but didn’t separate finances until about two months ago. Still both depositing paychecks into joint account. I spent the same per month, no additional living expenses due to staying with family aside from groceries/clothes/small weekend away.

She spent roughly 15,000 on new expenses from joint account. Which was previously at 36k balance consistently despite bills etc, basically saving a little bit every month but living right at our means. And she spent down the whole 36k from the joint account. I think she was transferring money to at least one credit card but taking a cash advance out and depositing into an account with only her name but can’t prove it yet.

I recognize some other payments from the joint account to be for various debt or credit type companies. My credit report shows no credit cards in my name that I’m not aware of.

Also state is MA if that makes a difference.

Yeah I know I might be screwed.