Here in the USA theres a unwritten code for friends dating their x's and or people dating others when they know their friends like them. Obvioulsy theyre not true friends if they do it-but it exists!!! A lot of friendships end because of it. Ive been there.
FallenDarkAngel-you need to learn from this experience. The next you guy like-take some initiative FIRST before you run and introduce them to your friends. Then you know. In this current problem you dont have a right to be mad but understand why-I wouldve too-cause shes your friend. But it does happen. Try and be happy for them because it wont last-think of it that way-they wont be together forever-and youre gonna find a lot of guys out there!!! This will pass-
everything happens for a reason...beginning to wonder why.