It is not surprising to see an innumerable collection of unsuccessful relationships in literature, since that is the natural path in life. What is perhaps curious is the ingenuity of certain artists in portraying the reasons for the inevitable end, when everything usually happens in banal succession. Ah, Nietzsche, Schopenhauer, you misogynists! A relationship ends when the cycle of dissatisfaction begins. The first sign of this is the end, and it does not take a philosopher to see why. The nature of the dissatisfied side is invincible, invincible. No matter the circumstances, the past, the length of the relationship: once the innate tendency is manifested, the end is guaranteed. Because once experienced, dissatisfaction may cease momentarily, but it will come back to destroy. It is like the wild feline that tastes human flesh for the first time: from that moment on, its anthropophagic appetite will never leave it.