Issues With My Best Friend

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So my high school has a Fall Play every year and last year I was in it and i LOVED IT. It was my safe place and i felt really happy there and it was my special place away from all the other stress.

So my best friend, we’ll call her M, wants to audition this year. M is great, she’s been my best friend for almost seven years now. But I really don’t want her to audition. She’ll just be talking to the no-good guy she has a crush on (he says he likes her back but no one really thinks so and M won’t listen to anyone) and I’m worried it’ll take some of the magic away from it if she’s there too.

I feel so jealous and selfish and mean thinking about this, but it’s hard answering her questions about the auditions coming up. I feel like she only wants to be in it for the guy and I feel paranoid that she’ll take my place in the cast. I feel really petty, but should I tell her how I feel? I don’t want to ruin our friendship