What does it mean when a guy that follows me on Instagram all of a sudden stops reacting to my stories. But still watches them and likes every post?

He used to react to every story. I would react back as well because it didn't want him to feel left out. Now he has stopped reacting completely but he still stalks me. I am confused does he like me and is just intimidated or what?
What does it mean when a guy that follows me on Instagram all of a sudden stops reacting to my stories. But still watches them and likes every post?
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