Unfortunately, the publication of PMs is not a violation of forum rules. Therefore, when we send someone a PM, we can only hope for basic decency. I believe that the publication of PM (without consent) should be tagged.
I would like to know the opinion of the community. May be in this topic...
If in the opinion of the community it turns out that this is not a trust case, then I will remove the tag or will replace it to a neutral one.
I don't think it needs a red tag, not in this case anyway. Perhaps someone publishing a PM that they
promised to keep secret would be worthy of negative trust, depending on circumstances. In this case it's just a dick move. Can't red-tag every dick.