I deeply love this girl, but my best friend likes her too!?

Sounds like she can't keep a boyfriend!! But, for now you should just try to be a good friend to her. Then try to go another step... Just whatever you do, don't get her boyfriend mad. Try to make her like you more, without having Dane notice and get mad at you. Maybe when her and her boyfriend break up, you could ask her out. Just get to know her better, and maybe tell her you have feelings for her... Best of luck!!! :)