"One major area couples often disagree about is money. Often, it boils down to each partner's philosophy on saving and spending," says Bennett. Some people take the view that if you have it, spend it. (YOLO, right?) Others, however, believe saving is the better value, which is probably smart, to be honest. "If you disagree on this, you'll be in a constant push-pull battle about what's the best way to handle your money," he says.