Fake Brother

I person who cares about you in a brotherly way. Someone who shows you love and hate at the same time. Someone who is overprotective over you about boys. A person who shows you off to all of his friends and tells his family about you. They are also a person who you can talk to and they will comfort you.

That's my brother.
Your blood brother.
No, my fake brother.
Oh well, he treats you like his sister.