Why is it that my cheating ex boyfriend who I dated months ago decided to view my Instagram story even though we don’t follow each other?

Basically a few days ago I did a sfs which is a share for share on Instagram with a mutual friend who knows me and my ex boyfriend and basically I sent the mutual friend the video that I wanted him to post for the share for share and then he sent me a picture of him that he wanted me to post for the share for share and basically I’m pretty sure my ex boyfriend follows him and the mutual friend follows him back and basically within minutes or a few hours when I got back on Instagram to check my views my ex was in my views and viewed everything that I had posted on my story that night its very weird because he claims to have a girl but does this and plus he unblocked me on instagram actually a few days before this even happened because he kept constantly blocking and unblocking me for some awkward strange reason but has a girlfriend 😂😂 and I noticed that he likes to put up a front in front of me as well
Why is it that my cheating ex boyfriend who I dated months ago decided to view my Instagram story even though we don’t follow each other?
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