Why is he just watching my story & not saying anything?

I added this guy i used to talk to briefly months ago because i needed information for something & he surprisingly answered since we ended on bad terms because i wanted to try even tho we realized i dates one of his friends years ago. anyway usually he would’ve unadded me after a day or two but he’s been watching my stories for a week now & we don’t talk so & he knows i have a boyfriend i just started dating now it’s odd because all i post is my boyfriend and my friends LOL.
Why is he just watching my story & not saying anything?
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