Maybe he was only interested in the beginning part of what you had to share. It could be that the first story caught his attention briefly but then something else distracted him from watching the rest.
He may be simply attracted by the thumbnail or the title of your first story. It's the first thing he sees and it draws him in immediately, so he doesn't bother looking at the others.
Perhaps the first story was the most eye - catching or relevant to him. For instance, if it was about a movie he loves and the others were about different topics, he would be more likely to stop at the first one.
It might be that he doesn't have enough time to watch more stories, so he just focuses on the first one. Or, he could be in a hurry and the first story was the most convenient for him to quickly check out.