Why did my ex requested to follow my Instagram?

Anonymous
I was dating a girl for a year, kinda a long distance relationship then she left me for a guy. we kept contacting for a while but I was emotionally abused so I blocked her from everywhere but Instagram (unfollowed). and we haven't talked for more than a month for the first time ever. yesterday she sent a follow request to my Instagram, I'm avoiding her, why is she doing that?
Why did my ex requested to follow my Instagram?
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