More difficult? How could it possibly be more difficult? She is giving up, and she claims he is making things worse? Frustration raises his voice so that he cannot even hear the note of desperation, the plea in his words.

"But you do not love him!"

There. It's there. Of anything he can be certain of, it's that Marian does not want to marry Gisborne, that she does not love the Sherriff's wolfhound--no matter what Gisborne might have insinuated.

He clings to that thought, to that trust in her, tossing aside earlier jealousies brought on by Gisborne's cruel words. She does not love him, she cannot. She must wish to escape this marriage, reason and honor and safety aside. He will not watch her marry a man she does not love.