Is my best friend playing on both sides?

I told my best friend about how a girl in my class I really liked too a toll on my mental health and made me feel terrible. He met her during our Spain study trip and hugged her. What is the possibility of her using him to gain information and using it against me? She complained about me to the university after I told my best friend about this. This girl went on a date with me, and was happy to go on another before beginning to ghost me and then told me she doesn't like me, but gave mixed signals. I wanted to constructively solve the problem, so I sent her an apology card with a poem I wrote for her. Still, she complained to the university.
Is my best friend playing on both sides?
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