Why is my ex-bf reacting to my Instagram stories when he’s the one that broke up with me?

He broke up with me couple months ago and I have not contacted him or given him any attention to his social media posts. Since we broke up, he’s been increasingly watchful of my ig stories and more so recently has been reacting with emojis. Why is he doing this?
Why is my ex-bf reacting to my Instagram stories when he’s the one that broke up with me?
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