What is the conflict with Agustus in the story?? Help Please

Augustus, 16 years old, meets Hazel at a support group for youths with cancer. Augustus lost part of his leg to osteosarcoma years before and is believed to be cancer-free, though he has a relapse midway through the book that leads to his death late in the book. He falls quickly for Hazel and they begin dating, though she is scared of hurting him through her illness. Gus is a witty character who loves metaphor, symbolism, grand romantic gestures, and he wishes to die with dignity for something larger than himself.