Sometimes she supposed she was not clever enough, that he found her inadequate and irresponsive.

Sometimes, with a sudden, half-guilty sense of disloyalty to him, she vaguely wondered whether there was some secret in his life--some past of which she knew nothing.

How could there be?
A man of stainless and brilliant reputation--modest, able, foolhardily brave, of whom all men spoke warmly; of a sensitive refinement too, which made it impossible to think of any ordinary vulgar skeleton in the background of his life.
Yet her misgivings had grown and grown upon her, till now they were morbidly strong.

She did not satisfy him; she was not making him happy; it would be better for her to set him free.

This action of his father's offered the opportunity.