It was not only that he had sinned against her by giving his society to another woman to whom he had at any rate been engaged not long since, at the very time at which he was becoming engaged to her,--but also that he had done this in such a manner as to make his offence known to all her friends. 
It was not only that he had sinned against her by associating with another woman, at the very time at which he was becoming engaged to her - but also that he had done this in such a way as to make his offence known to her friends. 