I might not watch your story because I'm really busy these days. There are so many things on my plate, like work and personal projects. I barely have time to check my own social media, let alone watch others' stories.
If I don't watch your story, you might consider changing the topic of your story to something more general or popular. That way, it could attract a wider range of audiences. Also, make sure you post it at a time when most people are active on the platform.
It could be that your story shows up in search results or is featured in certain sections accessible to all users, regardless of whether you follow them or not.
Well, it could be that she often posts things that make you feel envious or inadequate. For example, she might constantly show off her luxurious lifestyle. Continually seeing this can be bad for your mental state. So it's better not to watch her stories.
It's hard to say. They might be trying to be respectful of the break - up and think that watching your stories would be inappropriate. It doesn't always equal to not caring. Maybe they care so much that they are trying to move on in a healthy way and watching your stories would set them back.