I think it's an argument. You have two opposing points of view which breaks the song into two distinct halves. Most likely a breakup where one party wants to carry on & one doesn't & neither of them wanting to admit they are wrong.
"Because we don't know when we will die, we get to think of life as an inexhaustible well. And yet everything happens only a certain number of times, and a very small number really. How many more times will you remember a certain afternoon of your childhood, an afternoon that is so deeply a part of your being that you can't even conceive of your life without it? Perhaps four, or five times more? Perhaps not even that. How many more times will you watch the full moon rise? Perhaps twenty. And yet it all seems limitless..."