4. You check the social media accounts of the people he's dating, or think he might be dating
This is worse than checking your ex’s accounts. Not much more to say on that.
Solution: Imagine that every time you read the new flame’s Twitter feed — or worse, her horoscope — you’re making her that much more attractive. In a way, you are because you’re making yourself that much more dull.
[Photo via @tashoakley]