Its really time for you BF to say something out loud. This sucks.
BTW, I find it interesting that he is finding the most passive-agressive way imaginable to accuse someone-else of being passive-agressive.
I spoke with a friend about this, and one particular part of the diatribe was something like "it is particularly telling that the Bad Actor has not been in contact with me." Right...after he cut off contact with me and started disparaging me to my boyfriend to try to break us up...how exactly was that conversation supposed to go? My friend said "I believe the accepted standard is to make up things about him without giving his actual name, and then post it in a blog entry where everyone else can see."