I need to play devil's advocate here and ask a question. It strikes me too that your H would come up with such an utterly lame excuse about where he got his "information" about you and about what "D" was doing on your behalf.
But I wonder if it was really an attempt to protect the OW -- I suspect he was trying to protect himself. I think he might have indeed gotten the "scoop" from OW, but since that would violate the NC "rule", even if he did not ask for her to give him the info (and might have actually been delivered as a malicious taunt by her), he did not want to "give up his sources" to protect himself from accusations of continuing to have words with OW -- otherwise, I would think he would be glad to blame the rumor on OW.