Sometimes when you're in a relationship, some things are better left unsaid. There's no use in starting a fight or getting yourself dumped by revealing something that doesn't need to ever be mentioned. The key is to know when to share and when to stay a secret lover.

Checking Out Porn: Do you like to go online every now and then and check out a little something something? There's no use in giving up your guilty pleasure for a girl, but if you can't go more than an hour without checking a porn site, you might want to let your girlfriend in on the obsession. She might even join in!

Just One Night: A lot of people have a one night stand in their history. This is the perfect example of a topic that is better left in the past. Just as you don't want to imagine her sketchy moments, she certainley doesn't want to envision yours. No need to reveal this to your girlfriend unless you want to argue all night.

You Hate Her Friends: A girl's friends are among the most important people in her life. Telling her you hate her friends will be like telling your girl you hate her parents, so keep this one to yourself, no matter how annoying they are.

You Think/Dream of Your Ex: It's normal to think about an ex every now and then. It's when the thinking has crossed the line to calling, that it's time to spill. However, if your ex stays only in your dreams, keep it to yourself so you don't make your girl feel insecure.