Answer:
I read a book called Five Feet Apart.
In this book, the lead male character is a boy called Will. He was diagnosed with Cystic Fibrosis and eventually got B. cepacia.
Will is a rebellious and disorganized boy, and he likes to draw cartoons.
He never really cared about life because he knew he couldn't be treated and he would die one day.
Then he met a girl named Stella, and she gave meaning to his life and in the end he risks his life to save her.
I think he is a very interesting character and showed big character development throughout the book.