It's a story about emotional growth and self-discovery. The main character undergoes a transformation when they stop loving and crying, likely finding new perspectives on life and relationships.
I've never heard of September's Song. However, the author of A Moment of Emotion is September's Song. If you are referring to the author of this novel, I suggest you check the relevant websites or social media platforms for more detailed information.
It could also be that something in the story made him uncomfortable. For example, if the story contained topics that he didn't like or disagreed with, he would choose to stop watching it. Also, perhaps he accidentally clicked away and then just forgot to come back to it. There are many possible reasons for this situation.
It's possible that he lost interest in the content of your stories. If your stories have been about the same thing over and over, he might have gotten bored. Another reason could be that he has found other sources of entertainment or information that he prefers.
Perhaps there was something in one of your stories that made him/her uncomfortable. It could be a topic, an opinion or even just the way you presented it. So he/she decided to stop watching.