Keeping secrets in a relationship is more common than you think. And the extent of our secretiveness may surprise you too. It’s not just a single fling that we’re hiding either. A study from Columbia University reveals that we’re hiding — on average — 13 secrets from our partners! Read on below as we dive into the most common secrets to find out the impact on your relationship. These are the secrets you should never hide from your partner — and a few secrets that are OK to keep quiet about.