There could be several reasons. Maybe he's your biggest fan and is always eager to see what you post. It might also be that he has notifications turned on for your stories and got the alert before others.
He might be really into you. He wants to know all about you as soon as possible.
He might be super curious about you. Simple as that.
He might be your biggest fan. He wants to be in the loop about everything you do. So, he checks your story as soon as it's available.
It could also be someone who has a secret crush on you. They are so interested in you that they make sure to be the first to see any new stories you share, hoping to get a glimpse into your world and feel closer to you.
Maybe they still have some interest in your life or just happened to come across your stories by chance.
He could be attracted to you. Your stories give him a chance to peek into your world, and he enjoys that. He may be looking for common interests or just likes seeing what you're up to.
Maybe he's just interested in what you have to share.
Maybe he's interested in you or finds your stories engaging.
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.