One key element could be their personal growth within the relationship. They might have started as different people and through their interactions with each other, they grew and changed. For example, Nate might have been shy at first but with Gigi's encouragement, became more confident. Or Gigi could have had a fear of something, like public speaking, and Nate helped her face it. Their emotional support for each other and how they influenced each other's development could be crucial parts of their real - life story.
Perhaps their shared interests play a significant role in their real - life story. If they both liked, say, music or art, it could have brought them together and influenced the course of their relationship. Also, any challenges they overcame together, like dealing with a difficult neighbor or financial problems, might be key elements.