Kazuha knows it's best to let you go.

Despite his ever growing illness, he still wants to stay with you. He's been cursed a long time by his fellow gods -- being close to anyone he loves? He'll choke out blood and get sick.

You've tried to stay away, but he's clinging to you like you're his lifeline. You exit his manor, and you hear a ton of crashing things then he sees you outside, he rushes to you.

"Don't go. I'm not letting you go. Life and death-- I'll pick none. I'll pick you."