SHARE It’s all very well to keep your personal finances to yourself when you are single. But what happens if you continue this habit when you are married? Financial infidelity can have a devastating effect on a marriage and create huge trust issues between couples if one of them is not honest about money. From hiding purchases to having a secret bank and credit card account or taking out a loan without their spouse knowing about it are just a few examples of financial infidelity. In 2020, a survey by creditcard.com found that financial infidelity in marriages is on the rise, with 44 per cent of US respondents admitting they kept money secrets from their spouses.