This was the woman she had allowed herself to think SHE might be.

This was the woman HE was thinking of when he sat there; this was the Mrs.Fairfax the officers had spoken of, and who had made her--Mrs.Bunker--the go-between for their love-making! All the work that she had done for him, the deceit she had practiced on her husband, was to bring him and this woman together! And they both knew it, and had no doubt laughed at her and her pretensions! It was with a burning cheek that she thought how she had intended to go to Marion, and imagined herself arriving perhaps to find that shameless woman already there.

In her vague unformulated longings she had never before realized the degradation into which her foolish romance might lead her.

She saw it now; that humiliating moral lesson we are all apt to experience in the accidental display of our own particular vices in the person we hate, she had just felt in Mrs.Fairfax's presence.

With it came the paralyzing fear of her husband's discovery of her secret.
Secure as she had been in her dull belief that he had in some way wronged her by marrying her, she for the first time began to doubt if this condoned the deceit she had practiced on him.