Maybe he has lost interest. It could be that your stories have become a bit monotonous lately. Or perhaps he's just really busy and doesn't have the time to keep up with your stories anymore.
You could try to reach out and ask him directly in a friendly way. For example, say something like 'I noticed you haven't been watching my stories lately. Is everything okay?'.
She could be busy with her own life. There might be a lot going on like work, studies, or new relationships that are taking up her time and she doesn't have the spare moment to check your stories.
Perhaps there's something going on in his life that's causing him to be distracted or not in the right mindset to watch your stories. Maybe he's dealing with personal issues or stress.