7. Unexplained expenses.
If there are odd charges on your partner’s credit cards, or there is suddenly less money in your or your partner’s bank accounts, retirement accounts, investment accounts, etc., that’s a possible sign of infidelity.
If you ask your partner about these expenses, and their answers seem untrue, it’s likely that they are untrue. Infidelity costs money: gifts, trips, wine and dinners, hotel rooms, etc.
The costs of cheating can add up very quickly. If you see large cash withdrawals or evidence of purchases from places you rarely or never frequent, that’s not a good sign.