Now I think of breaking up as moving. Imagine you have your own house, full of your own boxes. A person you meet has his own house, full of his own boxes. When you have a relationship with that person, you shack up in a third house, into which you can each put any number of your boxes. You shouldn't move them all in at once, or else you will seem too eager. And don't dawdle too much either, or you will seem skittish about commitment. You kind of aim to match each other's pace, so that the power balance feels fair and equal. Happy marriage--at least ideally--would be the situation in which both parties enthusiastically choose to keep all of their boxes in their shared house. Conversely, when someone starts to doubt the relationship, he might move a box or two back into his own house, just in case. While he's weighing his options, he may transport a few more boxes to the safety of his own home. When he's ready to take back his final few boxes, he breaks up with you. If you were too infatuated to see it coming, there you are, with all of your boxes in the shared house, and none in the security of your own home.