Crush Help!!

I am 13 years old and I recently developed a crush on one of my guy friends. I’d say we’re pretty close, we have inside jokes and sit together at lunch everyday. The only problem is he is dating one of my best friends. I am not going to tell him or my friend about it since they are dating and they are happy, and i try really hard to be happy for them but on the inside it’s killing me! Someone help me please!!