In a well-written story, the romance should be the catalyst for personal growth. This is often referred to as the "Romance Arc."
For stories that center on building better relationships and authentic romantic growth, modern literature and film have moved toward "realistic romance," where communication and personal healing are the real "happily ever after."
Show chemistry through sensory cues like a heightened perception of the other's emotions, lingering gazes, or specific nicknames used only by them.
