Driving me crazy

i never thought it would get to this, but i'm crazy in love with this girl. the only problem is shes going out with my best friend, what do i do?

I'm afraid with this in mind, I would stay well away, this seems like a pan thats about to over boil. I know you cannot help your feeling's with his girlfriend but friends are for life not necessarily partners. Has she given you any indication she in is interested, because if she has then she may well do this to and think of going off with them also, then you will have no girlfriend or best friend. It is probably strong lust you are feeling for this girl, if I were you I would part your self from any activity involving her and try and remember this is your best friend you are potentially thinking of hurting here. Imagine if it was you, and how betrayed you would feel if yor best friend was thinking of stealing your girlfriend. Some things are better left un-said. What ever you decide to do, I hope it is the right decision for everyone involved.