He could be really busy. If he has a lot on his plate, he might not have the time to check out your stories. For example, he could be swamped with work, schoolwork, or other personal matters.
It could be that he's not really interested in that kind of content or doesn't think it's relevant to him. Or perhaps he didn't even notice that you shared the stories.
Maybe he's just not that into social media stories. Some people don't really care about them or are too busy to check. For example, he might be occupied with work or study all the time.