I spent my saturday grinding with my older brother's best friend
Did he not call you afterward?
He did, that's why I hate him so much.
Sometimes you can't help who you are attracted to, but you should try to avoid a relationship with a friend of your brother. It could hurt their relationship if things don't work out.
I know it was stupid, but he wanted me to meet his family and I knew that he would accept me and that hurts my brother.
I can understand that everyone has feelings. It is wrong to try and have a romance with your brothers best friend especially if you are not serious. If you have no interest in him just let him know before it gets carried away too far.