Should I tell someone about my friend's crush?
Is there a reason why you want to tell someone who your friend's crush is?
I don't want him to be betrayed by others.
If your friend told you who they are interested in romantically and they want it to remain a secret, it would be wrong for you to tell others about it. Friends are supposed to respect other friends and part of that is not betraying their trust and sharing sensitive information and gossiping about it to other people. Instead of letting out your friend's secret crush, keep that information private so that you can remain good friends with your friend.
You're a good friend and loyal. I'll keep it secret.
I'm excited to hear you changed your mind! I'm sure if you continue to be loyal to your friend you'll end up with a long lasting friendship.