UPDATE: My [27, M] girlfriend [26, F] has not spoken with me since I opened up about my childhood legal troubles.

Link to OP: https://www.reddit.com/r/relationshi...poken_with_me/
Thank you all for your feedback on my first post. I doubt that I would have been able to handle this situation so well without your help and advice.
So, early in the morning after I made my post my girlfriend called me. We did not talk much on the call, but she said that she wanted to meet me for lunch the next day to talk about the situation. To clear things up, when I first told her about what I had done, I did not give her full context. I was afraid that she would think I was trying to justify my crime, but after talking with most of you in the comments, I realized that it was pretty dumb for me not to have given her the full picture.
The first thing she wanted to know was why it took so long for me to tell her about it. She felt that I way lying through omission and that keeping that away from her is making her question what else I have been dishonest about. I told her that I was just afraid of looking like a monster in her eyes. It is often hard for even myself to accept what I did, who I was, and who I am now. This fear does not excuse lying to her for so long. By leaving such a big part of myself out of our relationship, I was not giving my full self to her, and that is wrong. This is what she is most upset about now.
I did end up giving her the full context of the situation, and I'll give you those details as well, I owe you all that much for the help you have given me. When I was 12, I tried to kill my mom's boyfriend. He had lived with us for a few years, and he was unbelievable cruel. He screamed at my mom pretty much every day. He cheated on her. He did nothing to provide for the house hold, and it was my mom who worked hard every day to make sure we were fed and taken care of. He had started to get more physical with her, like grabbing at her during arguments and raising his fists, threatening her. He was cruel to me as well, but it was nothing compared to the way he treated my mom. One day I snapped, and I attacked him with a knife. He survived, but he was hurt very badly. I spend the next five years in a juvenile corrections center. If I was older, I would have gotten longer, and I think the circumstances surrounding the attack also lead to what I am sure most people would consider a slap-on-the-wrist punishment.
When I gave her the full context she broke down crying. We actually had to leave the restaurant, and we walked to her place. After we both calmed down a bit, she told me that she did not blame me for what I had done, and that sure, I should have handled it ** much ** differently, but she said that it sounds like I was a abused and confused kid who was trying to protect his family. She did question me on how I view my anger now, what I think about using violence to solve serious issues, and what being locked away at a young age did to me.
I think I am probably a bit more angry than most people. I have never had a violent episode since or before that one, and I don't get into shouting matches with people, but I do have to get space and collect myself or else I can become pretty bitter. I do not think it is okay to use violence unless your life is being threatened.
Being locked up definitely did something to me. I am sort of jumpy and easily startled, which I think has to do with how I was often teased. No one ever tried to fight me there, but I am small, on the autism spectrum, and an easy target for being picked on. My experience in there also gave me a need for personal space, and I prefer smaller rooms. I also ** HATE ** meatloaf, it is a vile meal.
She told me that it would probably take her a while to fully trust me again, and that she will be questioning what I do and do not tell her. I understand that, and it would not be good if she just jumped back like everything was normal. I betrayed her trust, and I will have to work to win it back.
I did stay over that night, and we are going to go through with moving in with each other in January. She does want to go to some of my appointments with my therapist, and we may see a couple's counselor soon. She also wants to talk to my mom about all of this -- I am dreading that part because it is not the easiest thing for my mom to talk about, but I have already called her about it, and we are going to her house tomorrow night.

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tl;dr: I met up with my girlfriend and gave her the full context of what happened. We are staying together, but I will have to work to win back all of her trust.


Source.

*Opera voice*.....

DRAMAAAAAAAA!