Matteo 1:19

At this critical juncture, Joseph proved himself all that a true Christian should be: Then Joseph, her husband, being a just man, and not willing to make her a public example, was minded to put her away privily.

Unable to believe her innocent, which in the face of the evidence must have been beyond the average man's strength, he nevertheless found a way out of the difficult dilemma. As the betrothed husband he had the husband's rights and responsibilities. And he was a just man, righteous, a respecter of the Law, which was especially strict and uncompromising on the subject of infidelity in the woman, Deuteronomy 22:22-24.

Yet he did not wish to expose Mary publicly and thus heap ignominy and shame upon her, for she was the woman to whom he had given the love of a husband. His humaneness and benevolence, his affection, were put to a severe test. But the result of his weighing the matter was that he did not choose strict measures, resolving rather upon a quiet cancellation of the bond of betrothal, without assigning a cause, in order that her life might be saved. Justice was tempered by mercy.