As Mary’s husband passes along his news to Mary, what is stated in the story and what must be inferred? in slaughter to the lamb

Roald Dahl's "Lamb to the Slaughter," Patrick tells Mary that he is leaving her. These details must be inferred and are not directly stated. Mary is pregnant, revealed by a comment made early in the story that she is "in her sixth month with child."

Mary Maloney's husband tells her that he will take care of the child that she is carrying, to which she understood that he has been having an affair. She did not say much just that she will be preparing the dinner but later on she did hit his head with the frozen leg of the lamb.