well bro it seems she is not your gf nor u have tried to talk to her. I know there is hidden code in between guys or even gals not to hit on each others gf or bf or in this case even crush. You already know  that your friend is not following that universal code of friendship, why are you here and crying. Goooooooooooo and talk to girl let her know your feeling before its too late. If she is all for you than good for you, if not atleast you will have no regret that you didn't try for. Beside this, there is one more thing for you grow up, cause even if the girl you have crush becomes your gf there will be many guys who will be after her(if she is beautiful). What you will do than come back to sajha and cry again for foul. Grow up be man work hard for ur relationship but be real. You will meet many more people like your friend in this world hold your grounds.

lastly hope everything turns good for you.