Why does he continuously look at my instagram stories but never make a comment or reaction except for once?

I don’t know a lot about what some social media habits mean, but I wanted to know why this particular instagram follower continues to look at each of my instagram stories? I mean what does it mean? Does he like my stories? Is he interested in me?

The one time he commented on my story was when I posted about me graduating from college and he congratulated me. All the people that congrutaled me know me personal level and we have interacted with each other. This guy and me have seen each other years ago lol.
Why does he continuously look at my instagram stories but never make a comment or reaction except for once?
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