11 《生活大爆炸》中的这句该如何理解？告诉你不一样的which用法

       As it turns out, she was a North Korean spy. Luckily, Sheldon drove her out before I revealed anything important, which I’m not saying I would have.

语言点：

1. 这里which指代谁？

2. would have如何解释？

3. as it turns out从句如何构造的？