In English we were talking about relationships in Tragedies and Romances
Romances: The story is centred on the development of the relationship between two characters, and the challenges they overcome. They usually go through a sharp initial peak in happiness, followed by a descent into unhappiness, which is repaired at the end of the story.
Tragedies: Two characters seem to have a good relationship on the outside, but things that are supposed to make them happy are usually tainted, foreshadowing a devastating ending ahead.
If we look at the relationships of Sherlock and John, and John and Mary, which one seems to be the romance, and which one seems to be the tragedy?