When a relationship fails—especially between two individuals—unexpected events unfold. This is so because when a relationship is blooming, neither of the two parties bother to prepare themselves for the period when either of them would have to do without the other person in question.
That scenario is never entertained. In fact, a mere mention of the possibility of such a happenstance is considered a jinx. The fear of a relationship breaking up at seams is so high that when it actually takes place, we are scared beyond reality and scarred beyond imagination. It's quite palpable that not both the parties would have the same inclination towards each other. One of the two would very well—like they love to say nowadays—"move on" in style although that's something I'm yet to grasp.
How can people move on? Especially when you've invested time, energy and the potion called love into one person for an interesting amount of time. Especially when a piece of you is left in that person who has apparently moved on and you're supposed to move on from. Especially when it felt so real and eternal.
Maybe that's why it hurts one fine evening when you weren't expecting the memories to flood in. Because you thought you were done. Surprise, surprise! You never were and you never will be. That's not how a human heart works. We are animals, yes, but we are not the kind that takes a life for granted. We are the ones who look into each other's eyes and synchronize heartbeat. I shudder to imagine how it'd feel like when two heartbeats are out of sync.