Why does my brother not want me to date one of his friends?

Anonymous
I have a twin brother, we are both seniors in high school and I recently started seeing his friend.

He freaked out when I told him, I've never seen him that way, he was really mad about it and I have no idea why. I wouldn't mind if started seeing one of my friends, actually I think that'd be very nice.

I never really had a boyfriend but I have been dating before and he's never been that way. Also we are pretty close, I talk to him about my dating life all the time and never seemed to be an issue for him but why is it now?
Why does my brother not want me to date one of his friends?
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