She said I was obsessive but told me her ex is too and now this.?

I liked this girl. And I thought she liked me. She once told me of all her exes and even told me she had a crush on someone. I did mention to her I liked her and was hurt by it. She said she understood.

Fast forward a few more.months here ex came back ( nber one this girl like is gay and her ex wasn't) however she shared her picture with me and told me how she didn't like this girl anymore etc. Her and I got into a fight then she started comparing me to this girl saying I was,a basket case etc. Of course it hurt me and I let her know that because I still liked her. After I told her it hurt me that she did that she blocked me out of her life like I never existed. No.matter how I've tried to tell her I'm sorry she wont listen.

Why'd do she do this? Did I scare her away