Yeah, you know that was nobody but she said some cruel words, which cut him the quick.
要点解析:整个句子是一个宾语从句,主句是you know,宾语从句that was nobody but she said some cruel words, which cut him the quick。
宾语从句是一个表语从句,主语是that was,从句是nobody but she said some cruel words, which cut him the quick。这里的that是指代“他失落,郁闷,伤心的情况”。
表语从句中含有一个非限定性定语从句:which cut him the quick。它起到补充说明的作用。在这里补充说明“她说了这些残酷的话语”给他带来的后果。