Most Helpful Guy
Why do you need to? Are you flirting with her crush, do you want him for yourself? Your friends not going to do anything but cry and listen to sad music if you tell her. Stay away from her crush and be a friend.
Most Helpful Girl
You don't have to tell her. Why do you feel like that's something she needs to know? It's just going to create bitterness and hostility within your friendship. Keep that info to yourself and make sure you are a LOYAL, TRUSTWORTHY FRIEND who does not encourage her crush's feelings. You guys are kids: more guys will come. Don't break a bond over a boy.