If you started dating someone new and blocked your ex on Facebook, after ending that relationship what would be a reason to unblock your ex?

Anonymous
my ex did this and im confused. he texted me one day "get out of my life. i love her and not you. get over me. im blocking you" and then he blocked me. three months later, they end and i notice he unblocks me. what is the reasoning behind this?
If you started dating someone new and blocked your ex on Facebook, after ending that relationship what would be a reason to unblock your ex?
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