So here’s the news flash: Men, you have the power to make or break a relationship. That’s right. Research shows that what men do in a relationship is, by a large margin, the crucial factor that separates a great relationship from a failed one. This does not mean that a woman doesn’t need to do her part, but the data proves that a man’s actions are the key variable that determines whether a relationship succeeds or fails, which is ironic, since most relationship books are written for women. That’s kind of like doing open-heart surgery on the wrong patient.