Help if you can... Relationship stuff... Advice appreciated?

So me and this girl are in love with each other, but the problem is she went out with my best friend. Now I fully understand that this is a problem, but another problem comes in because I told my best friend I liked her even before they began going out yet he still went out with her. I would have asked her out before, but we were good friends and I didn't want to ruin a friendship (I'm sure many know what usually happens if people break up). Neither of us want to hurt my best friend, but I don't know what to do. He went out with her fully knowing that I liked her, but I still consider him a good friend. Should I move on or possibly go out with this girl? And should the best friend understand because we wouldn't do any ';displays of affection'; around him even though he did around me when he was going out with her.Help if you can... Relationship stuff... Advice appreciated?
Ahh growing up! Glad I dont have to go thru that again. Its all a learning thing. Sucks sometimes. I would be careful about how much you trust him and just how good of friend he is. Thats a BIG NO NO on his part. And if you go out with her never talk about about or ask her questions about him and her. You need to let that go if you want it to work between you. And I wouldnt worry about showing her affection infront of him. Infact if you dont it will casue issues between you and her. He can get over it and if he cant then say bye bye to him,Help if you can... Relationship stuff... Advice appreciated?
He is a ***** and thats it. Let the Girl go and Make better friends dont worry, girls come and go ..