Why does my ex watch my story instantly?

We broke up almost 2 years ago, he is the dumper. The breakup was due to my mental health that it affected us both in negative way. I still miss him though, because he treated me so well during our relationship -- it's just my depression kinda kill him too.

I followed him again on Instagram early this year. Not much texting happened, but if we do dm, it was a nice and no-grudge conversation. But he always watch my story, almost instantly. He never skipped watching my story even though I posted a lot, like A LOT. He also liked my story if I posted about my achievements, and he always like my posts of my selfies on the Instagram feed. Why does he act this way? Why does he keep watching and liking my story and all?

Why does my ex watch my story instantly?
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