How should i feel??

My bff called me. She said she had plans and lets go camping at the beach in the weekend. But I refused, said I was tired.
I did not want to go and i have to prepare for my test on Monday.
She got angry like she always does but this time she said some stuff that really hurt me. I feel like I don't have the right to be my own person with her. That I should pay attention to her always.
I dont have time for myself. I like spending time with myself sometimes. I need to breathe but it's like she does not want to understand.
She ended up insulting me saying things like i'll end up alone and that i am selfish
She brought old grudges I did not know she was still holding and said things she knows will hurt me deeply.
Then she proceeded to tell me that she was blocking me on every social website she uses.

I dont know what I should do??
I feel hurt and insulted and caged but I also know that she is dear to me.
I feel like i am the one whose wrong and that I should apologise while another part of me feels like I should let it be.
I am losing my only friend and I feel guilt and relief at the same time.
What should I do??
Plz help...☹