Instead she spends days staring at his picture and freezing out potential suitors. Her despairing grandmother The Dowager Countess of Grantham, who is played by Dame Maggie Smith, tells Mary that in order to move on she "must choose life".
Michelle Dockery, the actress behind the aristocratic ice maiden, understands how she feels.
The departure of Dan Stevens, who portrayed Matthew, has left her bereft too. "I do miss him. We had become close and it has seemed strange without him," she says.