How do I stop having feelings for a friend?

DarkFite
I'll keep it short. She is one of my best friends and now I have known her for 2 years. She is my best friend's ex-girlfriend and lately I am starting to get feelings. I don't like that because she is important to me and I don't want to ruin a great friendship. Recently she created a Tinder profile and tbh it doesn't help that we matched as a joke. Maybe I'm trying to get over the rejection on my last date and that's why I'm starting to think about my friend, but like I said, I don't like it and don't want to risk it. How can I cope with this? It also doesn't help much that we are all pretty open and occasionally play drinking games where you kiss the other person or something like that. I know it might be a bit weird but actually it's always fun evenings where you meet new people. Only in this specific case it's a bit hard.

Some additional infos:

- I didn't match her first. She was the one who liked first. Before that she told me that she made a tinder profile and since she knew that her profile showed up for me it would have been weird if I didn’t swipe

- She is attractive, but not usually my type. It's more the personality and interests that we share. For example, it's the second time she's asked me if we want to dress up as the same character for the next party. Things like that make it difficult rather than easy

- And yes, she is my best friend's ex, but firstly he has done the same thing in the past and secondly we have talked about it and said it would be ok if we talked about it before anything happened. We are all in the same friend group and now it's been over 2 years since they were together.

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How do I stop having feelings for a friend?
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