As a BH I would not want any contact with the OM.
I believe that a OM would never be honest with me.
I have no reason to forgive the OM. I do not go
around actively hating the OM.
An apology from the OM?
What would he say?
Sorry for banging your WW.
When you can not believe an OM if you were to ask
him about the affair to corroborate your WW's story.
How can you believe his apology?
How does his apology undo what he did?
I believe that when a BS makes their WS apologize
to the OBS all they are doing is using the
exercise of the apology as an act of penance,
humiliation, revenge, payback on their WS.
Yes the OBS deserves to know the truth. That is
the job of the BS to expose the affair to the OBS.
Giving hell to the AP is the job of the OBS.