I blocked an close friend and I really hurt her

I was beyond mad at her when I did it , When im mad , I dont consider others feelings or think straight , im destructive and an horrible person. Anyway , im really sorry I ended the friendship like that , I should have done it more maturally , but when im really mad or depressed , I struggle to make good descions. She may not ever see this , I dont expect to be friends again or even hear from her , Im going through so much shit and I just taken what she said to me personally , I didnt realise she just wanted to help me. I wish her well and I promise I will be extremely successful and truly happy one day. I hope to work through this with my therapist. I would have loved to have met her in real life , that may never happen , but I hope to be an better person