Why does my ex keep blocking me and unblocking me on Instagram?

My ex keeps blocking me and unblocking me on instagram after I’ve already asked him to stop. He doesn’t message me or leave a comment. Just unblocks me, looks at my story some of the time and then blocks me again. He straight up told me that he’s okay with the fact that we may not get back together (he broke up with me), yet continues to, I assume, stalk my IG. What is the reason for this? What could he possibly want or get out of this if he’s made it clear that he doesn’t want me?
Why does my ex keep blocking me and unblocking me on Instagram?
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