Well, if you're comfortable with it, you can do nothing. But if it makes you feel a bit uneasy, you could adjust your privacy settings so that only people you really trust can view your stories.
You could try changing the content of your stories. Make them more interesting or relevant to his interests.
First, think about your own emotions. If you still have some feelings for your ex and their watching makes you hopeful or excited, it might be a sign to re - evaluate your relationship. However, if you've moved on and it annoys you, simply block them from seeing your stories. It's your story, and you have the right to control who views it.
If your ex is watching your stories and it bothers you, you might consider making your stories private so they can't view them. However, if you don't mind, you can just leave it be. Maybe they'll eventually stop on their own. You could also post stories that are more positive and show how well you're doing without them, if you want to send a certain message.
No, not necessarily. As I said before, it could just be out of curiosity or he might find your content interesting.
You could try reaching out to them in a friendly way, like sending a simple text asking how they are. This shows that you care about them beyond just the stories.
Report the fake account to the platform. Explain that it's a fake account watching your stories. They usually have a process to deal with such issues and might investigate and remove the account if it violates their terms.
You might consider suggesting other forms of entertainment or reading materials that are more positive and relationship - building. For example, you could introduce her to some great novels or interesting documentaries.
Not necessarily. It might just be a passing thing. Don't overthink it right away.
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?'.
Don't overreact right away. You could start by casually asking him how he's been. Maybe he'll mention something about not seeing your stories.