Please help me with my besties

So long story short. At school my bestie is a boy and I really like him but as a friend. I dance and my bestie at dance - a girl I have known since I was 2- was having a sleepover with me. I then introduced them both. Now it’s all she talks about and she really likes him and I think they like each other Better than me. I want her to stop talking to him and I’m really jelouse as everything in her life is always really good like she gets the good roles the money everything and now I’m loosing him