She ended things by ghosting me but orbits my social media profile, what is going on?

Anonymous
Ok so the woman I was seeing just ghosted me, three weeks later I got somewhat of a reply from her which was really just "I want to forget things, no hard feelings".

I get it is over, and I don't want to rekindle things, I have seen her once in public with a mutual friend, we very briefly chatted and said goodbye to them both with her shouting across the street "Bye [insert my name]", weird for someone ghosting me.. No need for her to do that as we had already said bye. I just assumed she was being polite here, but it was weird, she kept looking to get my reaction when mentioning she had friends coming over to hers...

I have noticed she is the first to watch every Facebook story I post.

Why is she checking for my reaction and orbiting me on social media?

I don't look at her facebook profile/stories or contact her anymore.. Any thoughts?
She ended things by ghosting me but orbits my social media profile, what is going on?
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