Ok...I haven't been through this kinda thing since 8th grade. It was the end of the year before I told my friend that we both had a thing for the same guy. We had a fight didn't speak for the entire summer but neither of us went with the guy after all. And once school came back we were the same as before. Best of friends. Someone is gonna get mad you can be assured of that no matter what but the thing is you gotta tell. It will make you miserable not telling her, it will be much worse if she finds out from someone else and the guy is just not worth it in the end. There are lots of guys and you both have a lot of life left ahead of you and I can guarentee there will be lots of other guys and probably guys you will both like again. Be true to your friendship. Be honest tell your friend...things will work out.