A Friend Or A Traitor?

Hello! I am 15 years old from P. I am a girl. I want to share my story with you. A girl from my class and I were very good friends. We were inseparable. We spent every part of our day together. But then I entered puberty and my hormones changed. I began to think that she was not enough for me. I wanted to have other friends besides her and I decided to get closer to another girl. Let this girl be W. W. She also had a closer friend. But she was dying for male attention. She had started sleeping with the boys in our class just to be popular. W. was extremely annoyed by the fact that her friend was abandoning her, so we became close. She started to set me up against my original girlfriend. I began to avoid her. I was left with only W. A few months later, I realized that W. wanted to leave me without friends. He was constantly compared to me for everything. Constantly, when I talked to another person, he got really annoyed. I became kind of addicted to her. I understood what was going on and her secret "strategy". During this time, my original girlfriend and I had drifted apart. She was hurt and I was the cause of her pain. I was very sorry. So far, I'm super sick of remembering how I dumped her. She forgave me. It was very difficult to get it back. W. noticed that we had reconciled. She does her best to separate us. I don't know what will happen and how this intrigue will end, I just hope he doesn't turn everyone against me. There are a few people I can count on, but W. is capable of anything and I'm afraid I'll be left alone. Basically, I'm not a person who loves quarrels and I can't fight with a person for long. It passes very quickly and apparently U. notices this. He began to isolate me and set others against me. I couldn't stand her anymore, so we quarreled. Now I have no idea what to do. I'm sick, I feel sick, but until a person "breaks his head" he can't learn to choose the right people and hold on to real friends. I plan to finish here, there are still many unspoken things left, but if I continue, I will not be able to stop. I hope for one piece of advice :)