Just an interesting thought here; Kundera being honest enough to tell us that his characters are not real but of his own creation, perhaps the result of the egg of ego and the sperm of structure, has no problem with killing them all off before the story is done.
But isn’t this what a book should be? The beginning and end of a life or lives, not merely a glimpse. For it takes a while for a character to change, even within the space of 300 pages, for him to face what’s going on and make a choice. We as readers can interpret and judge all we like, each in our own perception, and yet, Kundera is unwilling to give us the final say. No, he tells us, they did not live happily ever after.
It all makes sense; Kundera has written this story to argue whether life has meaning or value; it is only logical to bring life to conclusion.