Why is he always watching my stories?

Me and this guy were became great friends as soon as we met and had insane sexual attraction. We kissed the day we met and had sex a week later. This lasted for 3 weeks-ish, it was amazing, I could honestly tell we were both happy and he made plans for the future until he all of a sudden just went silent on me. I guess he talked to one girl I was assuming and well a month later they started going out-or so I heard. I really liked this guy a lot, I dont think I've ever liked a guy that much. Had a tough time getting over him but I moved on eventually. I deleted IG (we followed each other there). January comes, I make a new facebook and he adds me on there. But doesn't say anything. Ever since then he’s been quiet but watches every single one of my stories. I am so confused. If you have a thousand fb friends, why would you watch my stories? We haven’t been in contact for so long, no way he is bored and goes through all of the fuckin stories on his timeline every time I happen to post. No one has time for that and I’m sure he doesn’t either. I unfollowed his profile so I don’t get updated on what he posts, so I give him zero attention back. Can anyone explain this behavior because I’m confused as fuk?
Why is he always watching my stories?
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