Historically, romantic storylines relied heavily on external conflict or problematic behaviors disguised as passion. Melodrama, miscommunication, and controlling dynamics often took center stage to keep the plot moving forward.
The conflict should arise because both characters are right in their own way. If one values security and the other values adventure, the tension is organic and difficult to resolve.
A hallmark of a "toxic" or low-quality storyline is the isolation of the couple—the idea that "it’s us against the world" and no one else matters. High-quality relationships recognize that love thrives in a community. Characters who maintain their friendships, hobbies, and career goals while being in love are more relatable and aspirational. They show that a partner should be an to a full life, not the sole source of it. Conclusion
For writers looking to integrate high quality relationships into their manuscripts or scripts, the execution requires intentional subversion of lazy writing habits.
The if you need a significantly longer, multi-page deep dive.