My (28M) girlfriend (27F) is mad at me for not telling her about my past

I met my gf in a park near my house, she was walking her dog then stopped for a moment at the same place I was sitting to stare at the lake. We started talking, really got along and exchanged numbers.<br><br>We've been dating for almost 3 years now, it's honestly been amazing. She's really special, beautiful, smart, we have tons of fun together, she makes me laugh, she has such a big heart for helping others, I love her so much. I am more in love with her with each passing day.<br><br>About a year ago I told her I wanted to take our relationship to the next level because I was not good at casual dating. I told her I wanted to be exclusive, that I loved her and asked her if she felt the same. She told me she loved me very much too, and I remember her words: "I feel so lucky to have met you, you make me so happy." And that moment I knew she was the one.<br><br>She moved in with me a few months later.<br><br>Everything has been great. <br>A few weeks ago when she was doing some cleaning, she found a box with some stuff from my past. Some souvenirs, pictures, stuff from my parents.<br><br>She asked me about it, and I said it was stuff from my past, that I kept it for the memories.<br><br>She wanted to see the pictures, and I told her I wasn't comfortable, it was from a very difficult time in my life. She said she wanted to know me better, everything about me. I agreed to show her.<br><br>The pictures were from when I was small, about 7 or 8 years old, at that time my father was an alcoholic and my mother was a drug addict. We lived in a van, and they would do lots of drugs in front of me. There's one picture of me sleeping near my mom while she did heroin, and other of me sleeping in the back of the van while they did something in the front. There's pictures of my father passed out on the floor, or of my mom breastfeeding my younger brother at a party, with people doing drugs around her. <br><br>She looked at me and said, "why didn't you tell me about this? Why do you keep your past hidden?"<br><br>I told her I didn't want her to worry, I didn't want her to know the truth.<br><br>She said she felt like she didn't even knew me.<br><br>After that, she has been really distant. She keeps asking me about my past, things that happened to me, how I ended up in the situation I'm in now. How was it being in the foster system? Did I get abused? Did I have any friends? How was it living with strangers that were not my parents? How did I end up on my own? How was it living in the streets?<br><br>I told her as much as I could, but she keeps complaining that I'm hiding things from her, that I'm not opened with her.<br><br>I just don't want to remember those things, I want to bury the past and move on. That's why I don't talk about it.<br><br>But she says that for her to feel safe, I need to tell her everything. That she feels hurt that I didn't tell her about my past on my own. That I didn't trust her enough.<br><br>I don't know what to think, I love her so much, I don't want to upset her. But I also don't want to talk about my past. I want to move on, be happy with her, and forget about those bad days.<br><br>I just want to move on with my life with her, be happy and leave the past behind.<br><br>What should I tell her?<br><br>**TL;DR:** My gf mad at me for not telling her about my past as a foster kid and living in the streets.