Why is he doing this, we haven't talked in a month and he checks my stories everyday?

Why does my ex that I unfriended on Snapchat views my stories and takes screenshots of the things I eat and my cats, but doesn't take screenshot of my selfies. also he has me blocked everywhere but its always the first one to watch my snaps?
Why is he doing this, we haven't talked in a month and he checks my stories everyday?
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