GUYS: 15 ways to cheat on your girlfriend to not get caught

5. Watch What You Put On Your Credit Cards

This one should be a no-brainer. If your girlfriend looks at your credit card slips and there are charges for motels (or God forbid, romantic dinners that you never took her to),  she just might come at you with a knife.  When you are hanging out with your secret girl, pay in cash. Or better yet? Make her pay.