Walter begged her pardon for all the pain he had caused her.

【pardon】沃尔特请求她原谅自己给她造成那么多痛苦。

Um, so as much pain as it causes me, I am so grateful for all the pain that I've gone through.

嗯， 虽然它给我带来了很多痛苦，但我非常感激我所经历的一切痛苦。