Why is he still watching my instagram story?

Anonymous
I split up with this guy I was dating for like 6 months. It was a sad but amicable break-up, he needed time on his own (which he had never really been). We decided on no contact, though I did sent him a birthday text, and he replied kindly.

The thing is, it's been over a year since the breakup, but he still watches every single one of my Instagram stories, whether I post one or thirty a day, without fail. Why would a guy do this?
Genuinly interested by the way!
Why is he still watching my instagram story?
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