If I sent you a PM, would you publish it without my permission?
I might and I might not depending on multiple factors. As I've said before in this discussion, I've published many PMs sent to me.
When I send someone a personal letter or PM I've GIVEN something to that person. Read: IT IS THEIRS.
If I hold a preference of what should or should not be done with this gift then I should state that. Otherwise (OTHERWISE!!!) I've given something to another person based on trust of that person's moral and ethical standards to do with as they please because IT IS THEIRS; I GAVE IT to them. I gave it to them on trust based on THEIR moral and ethical standards. If, based on my standards, I later decide I misplaced trust then I cease trusting that person.
This is said from an ethical perspective and not a legal one, though these two perspectives often overlap.
As I said already, If you think _Morpheus betrayed you then my recommendation is that you don't trust him anymore. At this point all you're doing in this discussion is showing the south side of a north bound horse.