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。
