Why do they follow then unfollow then follow then in follow every few days on social media?

i have a friend, whose female, and she keeps following and unfollow every few days. i keep asking why she does that and she won’t give me an answer. anyone know or have an idea why?
Updates
+1 y
can i get also a woman’s opinion?
Updates
+1 y
but we chat almost everyday and she’s living with her boyfriend
Why do they follow then unfollow then follow then in follow every few days on social media?
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