Hills like What?

After reading the passage, I am throughly confused. Hemmingway is a confusing writer and if this passage is any indication of his work, he enjoys baffling his audiences. I assume that the two people are dating or something of that nature because the man and women discuss love and caring. They're relationship must have hit a down point because she tries to ask him if things will go back to the way they were. The whole time they are discussing an operation of some sort. While the women doesn't seem too keen on having the operation she would do it for the man, in attempts to win back his affection or something like that. The man know of the operation and is perhaps more intelligent than the women and seems to be trying to reassure her. The whole time they are drinking beer and it is never really stated what this operation is for and there are no real clues that can hint at what it was like. I get the feeling that the woman is younger and would do anything for the mans adoration, even an operation. I really hope this passage is explained because at this point, I am completely unsure. Her comment about the hills and his lack of response shows that she is perhaps not as serious as him and maybe not wise? I do not know.