In the state of Pennsylvania if my spouse has credit card debt in his name only, am I liable for the debt if he can't work, etc?

If the charges were for "necessaries" for his maintenance, there is some possibility a creditor could attempt to hold you liable, particularly if he has no assets or means of support. However, if you did not agree to be a borrower on the account, if he was solvent when the charges were incurred, the odds are that you could not be held liable.