Stab in the back...(kinda)

Okaii…what should I do if my bestfriendf knew I like this boy so much and she knew it …and I knew she liked him also by the way she wrote him comments on myspace…soo I was kinda mad about that and everytime I asked did she like him she would say no…so shes been single for a while and decides to go out wit the bot that I really like…like come on do friends really do that??? It got me really mad because I wouldnt do anythin like that to any of my friends…and so0 now they are going out and he also knew I like him and I actually still do alil but now im not because eveytime I get a guy that I like my freakin friends always like him tooo like wtf???…so what should I do???should I let my friend go???should I keep her??? Or ??? …and its not even worth losin a friend over a boy…but its the fact that just because you been single for a mad long time dont mean you go out wit a boy your bff likes like come on!!!…like this really hurt me because I’ve been likin this boy for a while and I know all boys go from friend to friend…but I never thought that this friend would actually go out wit the boy that I like and use to date kiss hug and chill wit??? So please what should I do im so confused right now…like what a friend man??? Ugh =((