We have all most likely heard of infidelity in a marriage, but what about financial infidelity? This is when one spouse conceals major financial spending and/or debts from their spouse with whom they share finances. In a study done by creditcards.com, they found that nearly 20% of adults in live-in relationships (29 million people) have a secret account that they are keeping from their spouse. Having major financial secrets in a relationship can easily lead to other trust issues and may really cause a marriage to struggle. So what can you do to save your marriage and your finances?