I don't want to sound like money is everything, but if money problems are removed from the table a marriage can survive almost anything. Agree on a savings plan and BOTH work to contribute to that plan. Whether working a job and pulling a certain percent from the paycheck, or working in the home watching prices and making wise purchases, you can both work together to build your nest egg. We actually have had a great deal of FUN seeing how much we could save without depriving ourselves of "things" too much. When we were younger our purchasing was on a need basis, and , I guess, we still look at things that way. "Do I REALLY need that, or will I use it."
If you use a credit card KNOW what that end of the month sum will be and PAY it off totally so you won't have to add any interest. That "good deal" will not be such a good deal after interest charges begin to add on. If this can't be done get rid of the credit card.
Still having fun after 30 years.