Loneliness. It was a familiar thing to the Uchiha, and something he thought he had managed to get over it. After all these years, loneliness was what he had known. The loss of Izuna was the cause. No-one else understood him, he claimed to himself. And so he withdrew into himself. He didn't need anyone. The only person one could rely on was themselves, after all.
But every so often, he would think back to before he let himself be that way. When his clan started to turn against him, when he overheard that snowy-haired Senju talk to his brother… it had hit him hard. And it hurt. Even with the reassurances of that man, the brunette with the warm smile, he felt empty. He was second-best, even to those who he held highly in regard.
He had seen that woman that his old friend was to marry, spent a long time hoping she would just go away. But then, it didn't matter anymore. Madara chose to leave. After all, why stay in a place he was only second-best at most, and at the least, openly resented and shunned? So, he simply left. No-one bothered to stop him, after all.
The first few weeks he spent wandering alone were the worst, and he was surprised he hadn't just let himself fall. But no, he was too stubborn to let himself do such a thing. Much too proud to admit to himself that he was in fact, all alone. Even if he couldn't cope with it. He forced himself to let his heart become ice, sharp and cold. Madara became cold.
Then the time came where he decided to destroy that which he had made. It would surely make him hurt less, if he just got rid of what caused him pain. The battle was fierce and bloody, and the Uchiha gave it his all. But it was not good enough. The finale. He was pierced through the back, into his chest. Maybe it would finally be over. The dead don't feel after all, he supposes. But when he fell, he watched the other get up and start to walk away.
The loss of blood and chakra was making him feel dizzy. He was too weak to call out. Too weak to lift a hand, to try and beg the other to stop. To come back for him. A tear streamed down his cheek, and as everything went blank, only one thought raced through his head.
Please don't leave me.