Most Helpful Guy
Maybe he's not angry anymore or whatever he felt to block you.
Most Helpful Girl
He may have had second thoughts about blocking because he regrets it. He may miss you in his life so is leaving a " door " open for you to come back into his life
Sometimes people block in the heat of the moment. When they feel hurt , upset and angry they'll may make a hasty decision and block you. When they've calmed down, and they're are thinking more rational, they realise they made a mistake , so unblock you