Why was Lincoln's so cheerful now why was his wife Mary unhappy?

Lincoln was cheerful due to his recent political successes and the progress of the Union Army during the Civil War, which gave him hope for a favorable outcome. In contrast, his wife Mary was unhappy due to personal struggles, including the loss of their son, depression, and the immense stress of her husband's presidency during such tumultuous times. Their differing emotional states highlighted the strain that the war and personal tragedies placed on their marriage.