Originally Posted by opalescent
He wants to end it with her in the dark. Easier for him but not the best thing for him, for her, or for you or your husband.
If his relationship with his gf is certain to end soon, what is to be gained by him revealing the truth that he is poly with another couple? In this case, the truth will only create anger in his gf.
While I support the truth in most cases, I think this one is exceptional.