Nothing! If he likes one of you, yhen the other freind should be understanding and let them b happy otherwise their not really your freind. But if he likes neither of you, let it be.
Answer
Let it be up to him. Don't step aside if your friend wants him; after all he may be interested in you and it will look like you are not!
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Then you like your friend but, if you know that you liking him might jeperdized your friendship then i say dont tell him that you like him. If he likes you and you know he does then that's you guyses decision.
Communicate openly with your friend about your feelings and try to come to a mutual understanding. Consider discussing the situation with the boy involved and letting him make his own decision. Remember that friendships are valuable and should be a priority in situations like these.