<human>: Almost a year ago (it'll be a year in February), my mom's boyfriend of 10-ish years (and someone I've known since I was 6 give or take) sexually assaulted me (I was 16 at the time). He'd been acting uncomfortably intimate with me for about a year or two before that, but I never mentioned it to anyone because I wasn't sure if it was normal or not since I've always been weird about physical contact and intimacy in the first place. The day it happened, I told my mom when she was picking me up from the building I was testing at for school, and she made me stay with my aunt while she kicked him out. Obviously, the police got involved; ultimately he was never arrested (my mom was continuing to defend him in a way and thought I was overreacting when I gave my opinion that I wanted him to be arrested because he ruined a lot of progress I was making on mental health issues and my ability to trust in general, but that's a whole different thing), but was registered as a sex offender.

The other day, he had to stop by the house to pick up some of his things. When he did so, apparently he gave my mom a letter and told her to give it to me. She told me about this and asked if I wanted to read it; I told her no, not yet, because I'm unsure if I even want to, and if I do want to I don't know if I'm ready yet because of the first issue; should I open it or not in the first place?

I understand that this is ultimately something for me to decide, but because of mental health issues I have a very, very hard time making decisions for myself and need the opinions of other people. Opening the letter might offer me closure to the situation, which would be really nice admittedly, but it also might expose me to emotional distress that would be harmful in the long-run. I'm also noticing that I feel a strange obligation to open the letter, as if I owe him something; the idea of not opening the letter makes me feel incredibly guilty and anxious.

I guess I just want some opinions and advice on what might be a better idea, please and thank you!

Could you distill the essence of the text into 1-3 sentences?
<bot>: Someone who hurt me sent me a letter, not sure if I should open it or not because on one hand I might get closure but on the other hand it could hurt me further.