<human>: Give me the gist of the text in a nutshell

My girlfriend recently told me that she was sexually assaulted when she was in high school. We didn't discuss it in detail she just mentioned that it had happened. It is a background issue in the relationship, she sometimes has nightmare about it and wakes me up to talk ( I'm happy to do it, me losing sleep is not the issue). I want to be sensitive about it, but I think we need to discuss it more as it was clearly a major event I. Her life. My question is how do I approached her and what sort of things should I be sensitive to?  

Thanks for your help.
<bot>: Gf was sexually assaulted 8 years ago, as bf, I don't know what sort of things I should be sensitive to.