Before I say anything, I want to first commend you.
You are such a great writer! I love the way you effortlessly articulate your words. This was so easy to read because every idea and paragraph flowed easily onto the next. And your use of idioms and comparisons is just admirable.
Now it's unfortunate that you had to go through that. Girls at that age are so insecure and catty, I don't blame you or your friend actually. It's just one of those things that we experience and learn lessons from.
At least you won't make the mistake later in life.
Something similar happened to me not to long ago and it was not pleasant at all. I have learned my lesson and never again will I intervene in another person's relationship or even give them advice. My experience taught me that love turns people in fools, and I mean that in the kindest way possible.
I'm not going to get into it but just be safe out there.
Have a nice election weekend!