A perfectly valid reason for breaking up with someone is that you come to realize that you simply cannot abide their tiny square teeth that resemble Chiclets, it dawns on you one day that you've never been able to trust people with small square teeth, like your stepfather for instance, whose tiny rodent-like teeth suggested treachery and disloyalty and came to represent in your mind all that could go wrong in a personal relationship. Another legitimate reason is that you cannot continue to ignore the fact that their gestures so often come a beat too late, strangely unsynchronized with the utterances they are intended to accompany, rendering them laughable and even grotesque, or suggesting the crude rigid movements of a prototype robot. Is it permissible to dump someone who stubbornly refuses to correctly spell a particular word, like for instance "couscous"? Yes it is. Is this fair? No it isn't. What about clammy hands? Is a moist grip sufficient grounds for blowing an otherwise workable relationship to smithereens and very possibly condemning you to a permanent state of solitude? Yes. How about fussiness concerning breakfast cereals? Yes. A baffling obsession with anything "Celtic"? Of course. The way they think nothing of taking food into the bathroom with them? Absolutely. What you can't endure in a person is often just as mysterious as what attracts you to them in the first place, in fact you could say that an obstinate refusal to be reasonable in the matter of picayune complaints of this kind is in fact a sort of backdoor statement of faith in the power of romance. Yes you could say that, but it would be really stupid.