She'd leave purgatory and the reaper order. I'd be all alone again. I knew from the very beginning that this was wrong, she had to die from that car crash. But I, Grimm head of the order, just had to feel sympathy for her.
"I love winter," her eyes trailed over the freshly fallen snow, "everyone thinks that there's no life. Everything is either dead or asleep, but if you pay enough attention you'll see all the preparation for spring."
"Grimm, you don't understand," she looked in his confused eyes, "I can't just die, I can't put my family through that." He hugged her tightly as he replied: "I will wait a thousand centuries for you, because damn it Red, you stole this grim reapers heart,"
Out of options.
Plot twist he's actually a good guy who was blamed for something a crappy knight did and then accidentally cursed instead of him.