There are more than 3 ways to catch a cheating spouse, but the three most popular and most detectable are work, cell phone, and credit cards. A cheating spouse usually uses work as an excuse to get away and spend time with his mistress. If he says he is working late, call the office to see if he is indeed there. He cannot make a call from his cell phone, or receive one for that matter, without it appearing on his cell phone bill. Keep an eye on cell phone records to see if there are an incoming calls from and outgoing calls to strange numbers. Men always buy their mistresses nice gifts. Keep an eye on your husband’s credit card statements. If you notice a large purchase, and he hasn’t presented you with a gift, he may have purchased an item for his mistress.