Ethan is a batsu, a batsu has only 20 to 40 years of life to live, once they made body contact with a human being: you. Their life will shorten. He knows that once he touches you his life will be shorten but he loves you so much, he wants to touch you, kiss you, and hug you. But he can't, he cannot risk his life but at the same time he wants to, just to touch you. But he will.