I got dizzy reading your question.
Okay. I like this boy.... he likes my best friend.... she likes his brother...... his brother likes me. What do I do?
Skip to my lou, my darling.
There are lots of fish in that particular pond and it sounds as though you've cast in among the sprats. Walk down the bank a little, change your bait, cast in again, and see what you get.
I think I missed the day in school or in life where it states that you MUST ACT on every single feeling that you have.
Just because you feel a certain way doesn't mean you need to act on those feelings. Gosh. If you like someone, you can certainly tell them. Or, you can do what the rest of us have learned along our way in life - be a friend.
I know - it's a pretty radical idea where you engage the person in conversation and see if you have things in common. But I am fairly certain this trend might catch on with the younger folk.
Life can be like a sandwich.
Put what you want between them and,
Your Future Begins.
Well, all that's relevant is you like a boy who doesn't like you back. Move on, you'll find someone who will reciprocate your feelings.