When A Swan Dies

A swan can live it's whole life with one partner. If their partner dies, they can die of heart break.
That is what described Sebastian's love for Helen. It was beautiful; pure. Their love story was absolutely perfect, or close to it. Sebastian never saw what was coming at him. When a tragedy hit their beautiful life, all he wanted to do was lay down, close his eyes, and give himself to eternal sleep. But he made a promise and he wouldn't lay down until that promise came true no matter how broken his heart and life was.
So, what really happens when a swan dies?