I'm a guy with a girl best friend. I have fallen for her. I'm not sure if she feels the same way.
Should I just tell her?
Cheers.
Take a leap of faith and tell her! You've got the world to gain... and well, hopefully experience minimal losses.
I mean... if you're afraid of risking your friendship, then just think about if she gets a boyfriend. Pretty sure you'll get hurt (as you are harbouring feelings for her) and in the end your friendship will still get tinted.
Love is like a stock market (dear Lord, I hope my limited economics knowledge will help me pull of this metaphor). Sometimes, you just gotta risk your money and invest in a profitable looking business/ stock. Likewise, you need to risk your friendship so that you can potentially get something more from it (a relationship if that is what you are after). In both the business world and love: it's all about the guts
hahaha sorry for that really corny advice. Anyway best of luck with her and tell us how you go!