Jealous eyes

Beer isn't the only thing that interferes with your relationship vision. Romantic jealousy can also blind you to your surroundings.

Need proof? Check out this research from the American Psychological Association, which concludes "jealousy can actually distract a person so much they miss what's right in front of their eyes."

So while you're intensely perusing your crush's Facebook page for ugly girls, you could overlook an amazing shoe sale right behind you.

Regardless of the article's scientific validity, it underscores an important point:

In dating, we often become so preoccupied with a potential for outside interference that we forget to nurture the inner forces more likely to lead to a relationship's demise.

So ditch the energy you spend worrying about a pesky ex-girlfriend and transfer those efforts to a relaxing dinner or movie date.

Then, once you've returned to the comfort of your own home, resume your Facebook stalking.

Just kidding. Kind of.