How is Hazel and Gus' relationship different from that of other teens?

Gus and Hazel's love for each other is different from other teens because there is no happy ending on the horizon. There is no thinking about the future because they don't have a future.... they only have the present. They have whatever time is given to them. Gus is more open than Hazel.... he doesn't hide his love and jumps right in. Hazel is more withdrawn. She never declares her love, even after she's certain of it.