Leave it in the past?

I was in an abusive relationship for almost 4 years. I was able to escape in late 2016. I was beaten, tortured, (only recently realized that sexually assaulted and raped), and I am not over it. I act like I'm ok most days but honestly, I'm just not over it. I still have flashbacks and I still get upset. I'm tired of feeling this way but its just something that sticks with you. I decided I want to start writing about what happened to me and I wanted to start volunteering with women that have been abused as well. I want to get my story out there and try to help other women. But my boyfriend said I shouldn't and I need to move on and forget about it. He said that I'm holding on to it and it really hurt me. When I was in the DV shelter, I was the second most severe case, out of 100+ women. It's become apart of me and those memories don't stop. (I've been to therapy). So, instead of letting it become something negative in my life, I want to use it to help others. But he says that I need to stop. I don't know, maybe he's right. I still suffer from PTSD (which he says is an excuse) but I don't often show it. I actually often act like everything is ok. But I want to help. Should I just leave it in the past??