Hi Pez, welcome to the forum
I am sorry to say that if she has feelings for another guy there is not much you can do
I wish you strength to go through this period - but that honestly is the only thing I can write.
If you have feelings for her you should not stay her 'friend' because that makes detaching yourself from her emotion-wise even harder. You will -I hope- one time meet the girl that was meant for you and your feelings should be free by that time
