How to ignore my best friends girl?

so my best friend is dating this new girl whose a total... sorry but whore, shes sexually active and is 13! i see that shes using him everyone agrees but i know this is just a phase and i need to just shut up. shes nice to me when hes around then glares at me when hes not looking. My friends all think she hates me because she knows hes really in love with me, but whatever im 13 there is no thing as love. what are some good ways to keep my cool when i feel like telling him what i really think?How to ignore my best friends girl?
set up a video cam,then you want have to tell him he will see for his self if not tell him you are 13 go outside ride your bike thire will be a lot more time for girls later,

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