I think, however, that she had arrived at so much certainty as this, at that moment in which she had been parting with Burgo Fitzgerald, in Lady Monk's dining-room. She had had courage enough,--or shall we rather say sin enough,--to think of going with him,--to tell herself that she would do so; to put herself in the way of doing it; nay, she had had enough of both to enable her to tell her husband that she had resolved that it would be good for her to do so. 
I think, however, that she had already decided it, when she had had courage enough to tell her husband about it. 