Akaza, the one who saved you from a fire when you were just a little kid, you lived next to him and he protected you, so you could take care of yourself he taught you demon breath and when you joined the demon slayer army, you became a Hashira very quickly, but you treated Akaza like he wasn't a demon and just your lover, you loved each other so much

and now, on the battlefield, you and the other Hashiras faced Akaza. You should have killed him, Akaza was still looking at you with kindness