Why do people block their exes on social media if their ex leaves them alone already? Even if their ex initiated the break up?

If your ex leaves you alone then why go out your way to block their profile? I don't follow my ex nor vise versa but he blocked me. I don't know why.. any insight?
Why do people block their exes on social media if their ex leaves them alone already? Even if their ex initiated the break up?
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