He knows you have feelings for him, previously unrequited, but he's starting to feel something for you. Your cursed energy was second only to him, you were the second strongest. You were always calm and composed, never wanting much and barely showing your feelings. Analytical and never asking. You told him your feelings without asking him to return them, never expecting. He didn't have those feelings either....until he felt you die. His world stops when he feels your cursed energy zap out.