Guys, 5 secrets you should never tell your girlfriend

4. Cheating in past relationships
You may have made mistakes in the past, but now you have the chance to make a clean slate. Don’t let her know about past indiscretions. Remember, when you get caught cheating, a woman will think “once a cheater, always a cheater” and always be second-guessing you and accusing you of messing around even when you are completely innocent.