Evidently, in Lady Gertrude's mind, Roger was the only person who mattered.

She herself was of the utmost unimportance except for the fact that he wanted her for his wife! She felt as though she were a slave who had been bartered away to a new owner.
"You understand, now ?" Lady Gertrude's clear, unmoved accents dropped like ice into the midst of her burning resentment.
"Yes, I do understand!" she exclaimed, in a voice that she hardly recognised as her own.

"And I think everything you've said is horrible! If I thought Roger looked at things like that, I'd break our engagement to-morrow! But he doesn't--I know he doesn't.

It's only you who think such hateful things.

And--and I won't stay here! I--I _can't_!" "It's foolish to talk of breaking off your engagement," returned Lady Gertrude composedly.