But why would she owe him an explanation for why she doesn't want to get married? Their relationship is at least nominally right now purely professional. His intention to get married matters because their whole deal is about her helping him get a bride, but if we're being silly and taking their contract at face value then there's no reason her marital status or any plans of changing it matter in the slightest.
Also, he needs a good detangling brush, don't settle for having your hair painfully yanked and tugged all the time; there's a better way.
It makes sense for this isolated and pitiful man to push all his hopes on her and to fixate on her. She is probably the first human in a long time to actually spend time with him and treat him like a person.
Yet, he barely knows her and has no right to her feelings nor her memories. He is still an oaf, who kidnapped her and made her help him.
On top of that if feel like he is lacking some spark. Or a certain charm. I simply can't see her falling for him nor anyone else.