Well she wasn't really talking about the circumstances of my PTSD, she was asking her friends for ideas about how to help me sleep, and because she gets stressed out thinking about me sleeping alone.
I have a hard time falling asleep because my parents used to beat me at night if I tried to stay awake and read. If my wife isn't sleeping next to me, it is almost impossible for me to relax enough to sleep at all. I get anxious thinking about a date months in the future where my wife won't be at home... and this makes her feel tons of guilt and stress.
So she talked to her friends about it to feel better. And I don't want her to feel guilty so I'm glad if her friends help her relax about it. Many nights she feels like she should stay awake to help me... but while that might help I would rather at least one of us gets enough sleep.
Now if she talked to random people about it, or if someone else was talking about it without my knowledge... yes then I would be furious. It definitely takes a lot of trust, but if I can't trust her then I won't ever trust anyone again. She knows everything!