Why do does this guy watch my stores but not follow me?

There is a guy that I grew up knowing but we haven’t been in contact for years. Recently it’s come out of the blue that he has started watching all my social media stories. A couple of weeks ago I decided to follow him but he never followed me back and continued to watch my stories ( this needs he would constantly have to search my name to watch them. I am confused on what this means as it’s a lot of effort just to see what I’m doing.
Why do does this guy watch my stores but not follow me?
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