HOLY COW! When I read the original post I thought to myself "Did I post that and don't remember?!?!"
I swear this is exactly what I'm facing. Some of it early on was TT (although "minor" since I have her electronic diary). What happens now is that I bring things up and ask her questions and she tells me she doesn't remember. I can't really tell if she is actually blocking these memories or simply lying to me to avoid telling me, even though I have tried to show her that she can talk to me and I won't freak out.
There were a couple of really bad fights in our marriage years ago. One in particular occurred when I was watching TV and she walked into the room and demanded the controller so she could change the channel. I refused and she stormed off to our bedroom. Moments later I heard a CRASH and when I went to investigate I found my laptop smashed. To this day she can look me in the eye and tell me she doesn't remember this happening. I get very angry when I think about her not remembering. I would feel much happier if she simply acknowledged she lost her temper. Nothing pisses me off more than someone who lies to your face when you have evidence (I took photos of the smashed laptop).
I'm not really sure what I'm afraid of when I'm lied to like that, maybe I'm afraid that there is more I don't know and that the R is false.