Why do the chronically single do this to themselves?
Over and over again, a sane and rational persons will lose both hearts and minds to other human beings. They're giddy each second they are rewarded with the company of their choice. Thoughts of the beloved wander unbidden into their minds when they're buying toilet paper or wrangling lunch from a street vendor. Before they know it, they begin to wonder, is this it? Is this the one they've been waiting for? They may even discover that the beloved is wondering the same wonderful things about them. The future seems cast in a pastel glow like a July sunset.
And then, before anyone knows it and seemingly out of nowhere, it all comes to a horrifying applying-the-brakes-at-Indy unbelievable end.
"Why" doesn't really matter, even if it's the nagging question that haunts the mind. Maybe figuring out the why can help the heartbroken in the recovery, but it's not terribly likely. Why will only sprout more questions and self-doubt.
What does why matter, anyway? It's not going to change the present--only living in the present can do that. In the end, these unfortunates all have to cope. They all have to deal. And then they need to move on with our their.
If there's a worse feeling to being human than to have loved and lost (beat it, Shakespeare), no one wants any free samples.
The heartbroken thinks about this worst of feelings and wonders why they bothered in the first place. No one who swears off love seems to stick to that oath. Yet human beings keep at it. Over and over again they go looking for something they might not be able to describe, knowing full well the agony that could be the result.
Well, so long as they're going to keep at this crazy game of tag, they might as well learn something along the way. The end of love hurts. There's no dissembling about it. Parting from your significant other can take a person to depths of emotional pain like they've never imagined. But the end of a relationship isn't the end of them. They will go on.
The choice is whether to go on positively or go on negatively. There is such a thing as a good break up. Ideally this would mean a mutual decision to part ways, but the cooperation of the other person is not necessary to have a better experience. It is entirely up to the individual and their reserve of inner strength. Are they resolved to handle the end of the relationship as well as possible?