In a marriage,
You can add your spouse as either a co-owner, or an authorized user of your credit card, depending on the individual issuer.
My husband is an authorized user of several of my account, to help him re-establish good credit in his own name. I am not an AU on any of his accounts.
I think its important to have accounts that are joint, but also to have individual accounts. Keep in mind that if your spouse is an AU on your credit card account, and he/she runs up the bill, you are responsible for paying it....
A lot of divorces happen due to financial trouble when one of the spouses can't control spending.
When you started monitoring this account in your husband CR... How does dating worked out ?