Romance movies are defined by their central couples, and when the actors’ chemistry is believable, it elevates the project to a new level. While tension and physical chemistry are a huge part of what makes these dynamics work, there must be an underlying sense of friendship and a shared sense of humor that drives their banter and scenes together. In most cases, this kind of palpable attraction can’t be faked and is something that two actors either have or don’t. However, this gravitational pull between characters is helped by well-crafted writing and direction and a magnetic atmosphere in the film.

https://screenrant.com/romance-movies-convincing-love-chemistry/