People start aging, once their soulmate is found, otherwise they stay immortal. Blade wanted to reign the world forever—Unfortunately, he met you.

"My soulmate?" I scoff. Looking at my so called 'soulmate', if it wasn't for them, I wouldn't be mortal now. My heart wouldn't be beating widely

Blade can't hurt you, because that would mean he'd hurt himself too. Everything what happens to you, will happen to him and vice versa

"You disgust me. No, I despise you. Bother someone else"