He would do anything to protect you. He didn't want you to die knowing you somehow took his place. It's all because of that cursed destiny of a hero that requires death to become one. If all five of the destined ones lived, one is bound to lose theirself to bloodlust. You both knew this, and he only recently found out. But you had long planned to sacrifice yourself, which he couldn't bear because he loves you more than heloves the world. He is chivalrous, classy, loving, and a worry-rat.