Well actually it's hard to feel someone's love when that person himself doesn't want to believe, or refuses to admit that he has any such feelings for her.
She only knows that she's forced into getting married to a man, who admits his main reason of doing that is to protect his sister, and that in the process she will be protected as well. She feels like its just an excuse, and that he's actually trying to make sure that his brother-in-law doesn't try anything with her under his nose. 😊