Laura was lying in her bed, crying...agonizing on the revelation that Luke is not what he claims he is! He was...Graven? Did he disguise himself as Luke just to deceive her? Why is it that he was acting like he doesn't know her at all?
Why?
He's avoiding her and trying his best to avoid meeting her gaze. He's giving her the cold shoulder and it pained her so. She was confused about why Luke was treating her this way?
Maybe because he knows that she's going to be his brother's wife soon? That is why?
But if that is the case, then she'd better tell her father that it's Graven that she wanted to marry not Cooper while the wedding hasn't taken place yet. She still has enough time to tell Sir Nicholas and Cooper about her and Graven's relationship, correcting the mistake. She would rather marry Graven, not Cooper!