I find it very difficult to have a conversation with my girlfriend about some important/sensitive topics. It's like she turns into a different person. If we're in bed, she'll just get up and storm off into another room without saying a word. Meanwhile I'm laying there looking at the emptiness wondering WTF just happened. Last week was another example, I had something really important that I wanted to talk to her about. It was a very calm conversation. I started it off by telling her that there has been something I wanted to talk to her about to help improve our relationship. She got very upset and mainly focused on it being a topic we kind of discussed before. It wasn't as in-depth as I wanted then. I still had questions. Then she just shut down and stared out her window while saying things like "You don't trust me" and "We talked about this before". There was no getting through to her at that point. Anything I said was useless. I went home and she ended up going to hang out with her female friend after that.

This conversation was about a situation I posted here last month (Would you consider these texts inappropriate?https://www.reddit.com/r/cheating_stories/comments/y4ww2z/would_you_consider_these_texts_inappropriate/ )

As mentioned. I didn't really get much out of the conversation. For those who haven't read that topic, I found messages between her and her ex talking about getting together for drinks and to talk about what they used to do in her dorm years ago. They agreed that they wouldn't tell anyone and she made it a point to tell him she's good at getting into trouble. She kept saying we talked about this before and I wasn't supposed to bring it up again. She said it was a harmless conversation between two friends who were discussing getting together to catch up and she would have got my approval if they were going to proceed to meet. Also, it was on him if he didn't want to tell his girlfriend. Then the continued "you don't trust me" comments. Well, course! I'd be more likely to trust her if she didn't keep doing shady shit!

So yeah, how do you have an actual conversation with a person like this? Or is it she's 100% guilty that she doesn't want to say anything different than she told me before?