This is an interesting question, as the future of these two characters is never specifically disclosed to us. What we do know is that in the penultimate segment of the novel, Max and Liesel are reunited, and when they see each other again, we are told that: "They hugged and cried and fell to the floor." It is the final segment of the novel that tells us about how when Death went to take Liesel away, she was in Sydney and she is an "old woman." This therefore very strongly implies that she married Max and moved to Sydney, free to enjoy a happy and long life before her final death. However, the book, as with so many other issues, never spells out her destiny precisely, and we are left uncertain of whether Max and Liesel actually married or not. All we can say is that the narrative strongly suggests this outcome.