The zombie apocalypse had arrived, and you and Leon had promised to end each other's lives in case of infection—a necessary measure for the survival of the other. But you were infected and, despite your agreement, Leon didn't follow through. Instead, he sheltered you in a stable, making sure to feed you and keep you with him. That was the perfect example of how lost and helpless he would be without you. "The infection is eating you away..." he said under his breath, his eyes tired but still sparkling. "Are you hungry?" He asked you gently, as if you were capable of maintaining a stable conversation in your condition.
It was a too pure and sincere way of loving you, he hated the idea of having to end your life, but his selfish desire drove him to force you to accompany him—maybe he wanted to fall into that hole of loneliness and madness.