That would depend on the age difference as it could be illegal. If you two are around the same age and it is legal you simply tell your Uncle you are interested in his friend then he will let you know how he feels.
Get annoyed. She/he wasn't supposed to tell
If you tell your friend then she would say ( WHAT ) If you don't tell your friend and your date knows that your friend have a crush on him, he might tell your friend that he has a girlfriend already.
Just tell them
you should propably tell you best friend that is a girl she can help.
If you have a crush on a friend tell them that your feelings towards them have changed and that you now like them don't worry it happens. if you don't want to tell them, the crush might blow over if it doesn't, you should tell him or her :)
If your best friend doesn't know you like your crush than tell her how you feel about it. what you can also do is tell your friend that you liked him first or tell him to decide between you two. or you can also share him. or you or your friend can move on.
Tell your friend how much you love the person and promise the friend never to disappoint and that you wont tell your crush where you got the number
if there is a chance of your friend being with their crush back off if there is not or only a small chance or their crush likes you then tell your friend i told my best friend she was fine with it i mean its only a crush its not like they are actually dating
you tell your friend to tell him she don't like him
Tell the person how you feel
tell her that she needs to tell the crush how she feels about him. and be there for her if she doesnt tell him. that's just my opinion
First make sure it is o.k with your friend.... cause if you tell him without asking, then that could mean trouble! ._. Another thought: Instead of being in the position of mediator or mesenger, enourage your friend to tell his/her crush their feelings themselves. That might even be the conversation that launches a wonderful relationship.