I’m lost without her

A girl who I dated for 3 months, had an amazing time with, went away with me for my birthday and exchanged Christmas presents with decided to let me go on NYE by text because she wanted to focus on her son after he was struggling with the previous breakup. I swore at her by text that same evening when I was drunk and upset because I was hurting and now I’ve been blocked for 11 days with no contact. Does she hate me now? I want to write her a letter next week to explain that I don’t deal with rejection well because of my adoption. I just want her to know I was angry. Even if she doesn’t unblock me I want her to know I still care :(