我不会告诉他关于你的任何事情，因为这将是他一生中最大的快乐。

I shan't tell him anything about you, for it will be the greatest joy of all his life.

youdao

如果今天我是一个真正快乐的男孩，那都是因为你。

If today I am a really happy boy, it is all because of you.

youdao

我有的都是快乐的记忆，因为，你知道，一切都发生得很突然。

I have nothing but happy memories, because, as you know, it just happened out of the blue.

youdao

And he said, "Because if I see you unhappy, " I'll tell them."

他说“因为如果我见到你不快乐，我会告诉他们“

哈佛公开课 - 幸福课课程节选