Why do girls unblock and reblock a past guy when they’re in a placeholder relationship?

Girl I use is in a placeholder relationship with a guy who’s a friend and everyone knows he’s a placeholder. Anyway, I was blocked by her for 7 months and a month ago she unblocked me then quickly reblocked me and a month later I’m unblocked again.

What does that mean?
Why do girls unblock and reblock a past guy when they’re in a placeholder relationship?
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