Something to consider is that there are already a number of other books, both fiction and nonfiction, entitled "Breach of Faith." So I'd have to agree with the majority opinion.
I would also have to agree that the working title may not matter that much. Consider the working and final titles below:
James Agee Three Tenant Families (Let Us Now Praise Famous Men)
Nelson Algren Somebody in Boots (A Walk on the Wild Side)
Jane Austen First Impressions (Pride and Prejudice)
Stephen Crane Private Fleming, His Various Battles (Red Badge of Courage)
Raymond Chandler The Second Murderer, Sweet Bells Jangle (Farewell, My Lovely)
William Faulkner Twilight (The Sound and the Fury)
F. Scott Fitzgerald Trimalchio in West Egg, Hurrah for the Red White and Blue, The High-bouncing Lover, Gold-hatted Gatsby (The Great Gatsby)
Ernest Hemingway As Others Are, They Who Get Shot, The World’s Room, An Italian Chronicle, The Sentimental Education of Frederick Henry (A Farewell to Arms)
And so on...