How do you no the boy you like likes you back?
If he is always happy (not gay) around you then you know he has a crush on you (just like the one i have a crush on he is always happy around me)
depends do you care more about the friendship or the boy? do you like the boy back? if you don't like the boy your friendship is more important so tell them to f*^$ off. if you care more about the boy then you may loose a friendship. if you and your friend may look back and think it was stupid fighting over a boy so you might become friends later. good luck!