If your spouse travels for business – it’s normal for you to know where they are traveling to. Often they will be traveling between two cities where their company has an office. For example, between the NY office and the LA office. However, if your company has no such offices, and your spouse doesn’t have clients in certain cities, but they are always traveling to those same destinations there may be something suspicious going on. Also – if they can’t explain why they are going or the trips have erratic dates (such as weekend trips), they may be traveling to cheat on you.