you want to notify the OW's boyfriend about what's going on between WH and OW -- correct?
and ur not sure if OW and her boyfriend are still together... i think you said your WH talks as tho OW boyfriend is out of the picture....
perhaps ur WH is the reason for the boyfriends departure?
perhaps he too did not appreciate the *ahem* friendship between your WH and his WGF
others here that have been around longer that would know better