You are convinced that your spouse is keeping a lover on the side, but you lack evidence to pin him or her down. Well, you are not alone. There are a lot of husbands and wives out there who are being cheated on but still unable to do anything because their cheating spouses cover their tracks well. But no secret, especially one as bad as an extra-marital affair, can be hidden forever. Below are four sneaky tips that are guaranteed to help you catch your cheating spouse.