<human>: Can you condense the text into three sentences or less?

She's dropped a lot of hints that something very bad happened to her. She has a decent sized burn scar on her neck. I've let her know I'll listen if she ever wants to tell me what happened, but she doesn't want to tell me or anyone (she "wants it to go away"). I don't push her, but it clearly affects her (I think she may have PTSD) and I think we can't have a real relationship without the whole truth. I don't NEED to know, but my imagination about what happened could be worse than the real thing and it upsets me too. I'm guessing some sort of abuse or assault. I asked her once if she still talks to the person who did it, and I think she said yes. I feel like I need to protect her from someone, but I don't know who. There is evidence to suggest it may have been one of her family members. Is there anything I can do? Should I let it go?
<bot>: I believe someone hurt my girlfriend badly in the recent past, before we started dating. I want to help her but she won't tell me what happened.