No, St Joseph did not suspect The Blessed Virgin Mary of sin! They had both vowed to live as brother and sister, and being the husband of the Blessed Virgin, St Joseph could not have failed to see that she was very holy and pure. It is very important to stress the fact that St Joseph and the Blessed Virgin had indeed already been married at the time of the Annunciation. God would not have allowed his purest and most perfect creation to be in a situation where she would be suspected of grievious sin, neither his most Holy Son to be conceived out of wedlock.
It is very likely that The Blessed Virgin told St Joseph that her cousin Elisabeth was with child, but that she, in her great humility, kept quiet about the privilige God had given herself. The Blessed Virgin would not have gone to her cousin Elisabeth on her own, without any protection. Her husband would most likely have accompanied her and would therefore also have been present when St Elisabeth greeted The Blessed Virgin with the words: “Blessed art thou among women, and blessed is the fruit of thy womb. [43] And whence is this to me, that the mother of my Lord should come to me? [44] For behold as soon as the voice of thy salutation sounded in my ears, the infant in my womb leaped for joy. [45] And blessed art thou that hast believed, because those things shall be accomplished that were spoken to thee by the Lord.” He would also have heard the wonderful response of Our Lady.
St Joseph was a just man. He knew the writings of the prophets well and he knew that the Saviour, the Messiah, would come and be born of a woman. Something that had been predicted to happen about that time. He put two and two together. And the result frightened him. He was married to the woman who would bring forth the Saviour.
. “Whereupon Joseph her husband, being a just man, and not willing publicly to expose her, was minded to put her away privately.” St Joseph did not want to be separated from the Blessed Virgin because he thought that she had sinned. On the contrary, St Joseph considered
himself**** far too sinful to live in the presence of The Blessed Virgin and the Holy Child Jesus. How can we know this for sure? Because, St Joseph was a just man, and as such he would always obey the law of God. At that time, a man who suspected his wife of adultery was forced to expose her. That was the law of God. Joseph would not have “put her away quietly” if he had thought her guilty of adultery. Instead, because he knew that she was innocent, and most holy, he wanted to “put her away quietly” in order to protect her from unjust suspicions from others.
There is a lot more to say about St Joseph, according to tradition, the highest saint in heaven, next to The Blessed Virgin Mary. And little wonder is that, when he lived so intimately united to Our Lady as her husband, and to Our Lord as his foster father.
Please, correct anyone who says that St Joseph ever suspected the Blessed Virgin. I recommend you to read the book “The life and glories of saint Joseph” and to listen to this podcast from Audio Sancto:
audiosancto.org/auweb/20061224-The-Holiness-of-Saint-Joseph.mp3
I am very sorry if I have written anything here that goes against the tradition and fathers of the Church, it was unintentional.
Saint Joseph, pray for us!