This is pretty tacky

So I’ve been talking to this girl for months, whom which I had a crush on for nearly 2 years now. We’re at the “bestie” phase of our friendship (long distance) and it genuinely felt like she was into me. In fact we even went to an arcade together. Today, however, I came to learn that she likes someone else and I can’t help but feel gutted about it. She’s a genuinely great friend and I don’t want to lose my friendship with her, but it’s just that it doesn’t feel the same anymore. The worst thing is that she is exactly my type and not many people could replace her. How do I go back to seeing her as just a best friend and not a love interest?
Ps she doesn’t know that I like(d) her.