what should i do

I had a crush on a girl I met at tuition. Eventually, we became good friends—sharing great conversations and a nice bond. After waiting for a long time, I finally confessed my feelings, but she got very upset and rejected me. The friendship we had is now gone.

She has a male best friend. Before I confessed, I asked her if he was her boyfriend; she said no, though it seemed obvious they were together. Since my confession, our friendship has completely fallen apart. We went from talking constantly to being totally disconnected. It seems she didn't like that I confessed.

A friend told me she started hating me after that, which felt true because our conversations became toxic, and she started giving short, cold replies. I tried my best to save the friendship, but it was a waste of effort. Things got so bad that I ended up blocking her myself.

Now, I'm lost. She was my first love, and everything is ruined. To keep things hidden at tuition, we have to talk a bit in front of others, but her tone makes it clear she is angry me. Even if we cross paths accidentally outside, I can see the anger in her eyes. She was a great friend, and I don't understand how it all went so wrong. I even said sorry when she was angry, but I couldn't even save the friendship. Tell me, what should I do now?