Feel played by a girl .(has anyone gone through smthn simmilar)

Edit: ChatGPT helped me rewrite this for clarity and grammar because my original version was very long and messy.

Back in high school, there was a girl who showed me a lot of attention. She called me “husband” repeatedly, posted pictures of us together, grabbed my hand, and even made me dance at a birthday party. For the first time in my life, I felt chosen like someone actually saw me.

She said things that made me feel even more special. One day, she said there were a lot of guys she found handsome, but as soon as she started talking to them, she lost interest. Then she added, “No… not u, you are an exception.” I had never felt or heard anything like that before. A friend told me that she talks a lot bout me and that she even said one day that out of the all the guys of my class she would choose me , she gave several compliments.

Slowly, I started catching feelings. I wanted mutual interest, but I was very anxious and confused. Eventually, I confessed my feelings, hoping for a real connection. But she told me it was all a joke from the beginning and asked to pretend nothing happened. At first, I felt relief, but soon the pain hit like a knife. I felt played, humiliated, and betrayed.

Now I don’t know how I should see her. Some friends say she was just joking, and I shouldn’t take it seriously. I know she loved me as a friend,I was one of her favorite people. My mind automatically goes back to her all day, even when I try to think about something else. I can’t focus on my studies, my life, or anything else. I feel depressed(ruminate all day and cry) and sometimes like I’ll never find someone again, even though I know that’s not true. And I'd be lying if I said it didn't shake my whole self image and esteem.

I’m asking for tips: how can I finally let go? How can I stop obsessing over someone who treated me like a game? How should I process my conflicting feelings about her? I don’t know how long this will take.