I have always been a little disconcerted by the passion women have for behaving beautifully at the death-bed of those they love. Sometimes it seems as if they grudge the longevity which postpones their chance of an effective scene.

"But now -- now it's finished. I'm as indifferent to him as if he were a stranger. I should like him to die miserable, poor, and starving, without a friend. I hope he'll rot with some loathsome disease. I've done with him."

I thought it as well then to say what Strickland had suggested.

"If you want to divorce him, he's quite willing to do whatever is necessary to make it possible."

请教老师： I'm as indifferent to him as if he were a stranger. 

as...as if...这个结构怎么理解和分析呢？

我感觉是不是这样的:

I'm as indifferent to him as (I would be) if he were a stranger - 不知对否？

还有，说话的结尾处为什么不是I am done with him ?

谢谢老师！