Why does my bestfriend always change the subject when I bring up my crush?

So I don't tlak about my crush 24/7 or basically at all around her but when I do, she's not enthusiastic and doesn't seem interested and changes the subject almost immediately. She knows my crush and thinks he's overall a good guy, from what I understand they would do smoke breaks together but honeslty speaking I don't think she's Interested in him, because she acts a certain way when she's into a guy and she's already seeing a guy she always talks to me about. I find her behaviour kinda weird so I was hoping for some explanation as to why she acts like this.

Why does my bestfriend always change the subject when I bring up my crush?
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