Beat sheets are valuable tools for structuring and writing a story. They can be just as valuable when structuring and writing a relationship arc. In reality, I could write up a beat sheet for each relationship arc. Today, I've decided to go over the key beats, in the order they most frequently appear (which usually applies to positive change relationships).
In my previous article, I laid out a foundational approach to structuring your relationship plotlines. That will likely be more useful to you in structuring your relationship arc, than following these beats in the presented order. Once you understand the foundational principles, you can successfully manipulate any beat sheet to suit what you are writing. This is why I titled this post "key beats" and not "beat sheet." There are plenty of relationship plotlines that don't adhere to these exact beats or this exact order.
Nonetheless, knowing what is most common can help you discern how to handle yours. Your relationship plotline can follow this exactly, or you can vary it (which I'll talk about more at the end).
So far, we have covered relationship arcs, relationship plots, and the foundational approach to relationship structure. Let's finish this up with the common key beats.
In this ongoing relationship series, I intentionally picked relationship arcs that appear quite different from each other, to show variation. For this reason, I'll be using Monsters Inc. as a main ongoing example below, while simply referencing some beats in my other ongoing examples; Monsters Inc. follows these beats, in this order, exactly. (Many of my other examples, do not.)
(Note for below: "Character A" and "Character B" can be either character in the relationship.)




