A guy who craved love from someone who didn't love him as much. It ultimately led to his death is the theme that would fit the book well.
Reasons
1. Gatsby spent all his money and time towards a girl that didn't have the same affection towards him
2.Daisy never made up her mind if she wanted to go with Tom or Gatsby
3.After all this, no one didn't even show up to his funeral not even daisy the girl he showed all this compassion too
