Don't take it too personally. Instead, try to improve the quality of your stories. Make them more interesting, informative or engaging. This way, you might attract his attention as well as others. But don't change just for him, do it for your own growth on the platform.
Maybe try to have a conversation with him. Ask him directly why he doesn't watch your stories. It could clear up any misunderstandings. For example, you could say something like 'I noticed you don't watch my stories. Is there a reason?' This open communication can often solve such small mysteries.