I'm a 11 yr old boy who was close friends with my crush, now she likes another guy, what do I do?

you can do many things if she doesnt know you like her my best advice is to tell her.. cause if you havent you will be wondering over and over again 'what if i told her'... or if you think it could ruin you friendship you can just let her go for the other guy and be her shoulder to cry on when they break up and then start to make your move then so you seem like the good guy. me and my bf of 2 months where best friends before we started dating and now he is my best friend and boyfriend and its not weird at all everyone is different hope this helped :)