Am I completely over thinking this?

[Samantha]

Long story short, my ex and I are close. It's to the point where I am starting to, slowly, try to get back together with him

But there's this girl who I went to high school with, who apparently, is obsessed with him. But my ex doesn't like the girls who went to my high school (except for me, apparently lol) and said he'd never get with her. He also hates hanging out with anyone from my high school except for me, his best friend, and 3 of his best friend's guy friends
He knows her because his best guy friend is friends with her.


I texted my ex, and like a few minutes after I tagged him in something on Instagram, the girl that is obsessed with him starting following me on Instagram.

Is that just some weird coincidence or is she with my ex right now, saw the tag, and followed me on Instagram to "make fun" of me?


Or am I completely over thinking this because weird coincidences happen all the time??
wtf you literally didn't even help