In a breakup, you also feel a lot of physical symptoms as well. MRI scans and some other neuroscience studies have shown that the withdrawal of romantic love activates the same parts of the brain which are activated when we go through withdrawal. So it also sends the same signals to your body to pay attention to certain things and it creates physical pain as well. When you date someone and when you love someone, your identity becomes intertwined with them. There are parts of you that you associate with them that they've had kind of a hand in.