he probably finds you very attractive or maybe he wants to go out with you
To break up with your best friend's brother do this. Talk to the brother about this. Tell him that you are not interested in it anymore.
if yo really like the person you should feel fine
At certain points your friends will ignore whatever your brother because he is your brother but if your brother crosses the limit then your friends will never forgive him. Try to tell your brother that he is making a mistake
Just talk to the guy, Tell him that you are not interested in him and that he should just get over that fact. Then tell him that he should not stop his brother from dating you or hanging out with you because there is obviously something good about you and he shouldn't prevent that from his brother. He shouldn't be so selfish.
Even though your brother may be a pain to you off and on never desert your brother and good friends would not expect you to make that choice. Stand by your brother and find new friends.
His older brother
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No, they are not brothers. They are friends.
Phoebe's brother Frank thought she was a waitress on Friends.
Same way you would make friends with anyone else. Show that you are interested in them. You might start with things that relate to both of you. (example*I have a brother and a sister. How about you?)
Try talking with your friends and if they are not interested then they really aren't your friends to begin with and move on.
tell them you are not interested. if you are friends with them, then tell them that you only see them as a friend.