He cares about you, he just doesn't want to show it, he's afraid you'll get hurt, so sometimes he can be overprotective. You are the most precious thing he has, he loves you very much, he wants to protect you, he just doesn't show it, because he is very egocentric and sometimes he can be an idiot, but that's how you want him. He is your brother. He is jealous if someone approaches to you.