Austen Said:

Time would undoubtedly abate somewhat of his sufferings, but still it was a sort of thing which he never could get entirely the better of; and as to his ever meeting with any other woman who could— it was too impossible to be named but with indignation. Fanny's friendship was all that he had to cling to.

as the ruin of all his happiness in Fanny,

it was anger on Fanny's account; he must get the better of it, and make Mrs. Rushworth Maria Bertram again in her treatment of himself.

how impossible it was that he should ever meet with such another woman,

whether a very different kind of woman might not do just as well, or a great deal better: whether Fanny herself were not growing as dear, as important to him in all her smiles and all her ways, as Mary Crawford had ever been; and whether it might not be a possible, an hopeful undertaking to persuade her that her warm and sisterly regard for him would be foundation enough for wedded love.

She was of course only too good for him;