Bestfriend for 7 years or Cousin for life

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Van is my best friend fir 7 years. We go out almost every other day. Last week, I found out that he courted the girl whom my cousin courted too. He a asked me to be the bridge of his courting because he knew that me and lyn (the girl whom my cousin and best friend courted) are friends. But here's the problem, both of them didn't know that they were rivals. If I help my cousin then I'll be betraying my best friends and vice versa. Please help and thanks!