A：Does he know that he has already at his wits' end?

他知不知道他已经山穷水尽了?

B：I think he has realized that. But he is still whistling in the dark by putting up an act.

我想他已经意识到了吧。但他仍装腔作势为他壮胆。

A：He might be driven up a wall. You should not handle your relation with him with kid gloves.

他快就被逼得走投无路了。你应该用温和的手段对付他。

B：But when I noticed that he was left in the cold, I could not help wanting to help him to get out of the situation.

但当我看到他孤家寡人的时候。我就不自由自主地想帮助他摆脱这种状况。

注释:

at one's wit's end：不知如何是好，山穷水尽

drive sb up a wall：使某人走投无路，使某人受不了，促使一个人非常紧张、难受或者是使他很烦燥

with kid gloves：巧妙地, 温和地, 委婉地

handle with kid gloves：小心应付

leave sb in the cold：冷淡对待某人，对人冷酷无情，不理睬某人，冷落某人

get out of：逃避, 戒除, 由 ... 出来