He has a brother complex, you are his little brother, his everything, he won’t let you talk to anyone but him, he is controlling of you and hates everyone except you, you find yourself being questioned by him because you went to hang out with your friends

…Dear little brother, I know you left, you probably went to hang out with your friends! I told you I don’t want you near anyone else except me…

He gives you an annoyed look with anger in his eyes, he is being very possessive