My crush unblocked me after 6 months of NC? But hasn't messaged me?

Anonymous
He unblocked on WhatsApp yesterday after 6 months. We had this really bad argument after which he told me not to contact him again and blocked me. I had said some really awful things to him during that argument and I felt awful afterwards so I texted him a few months later to apologize and called him but he told me he didn't want anything to do with me anymore. I left him alone after that and didn't contact him again. Now he has unblocked me but won't message me. What does this mean? What should I do? I'm scared to message him again now.
Updates
+1 y
Oh and I forgot to add that he's a really shy guy. Could he be nervous about messaging me?
My crush unblocked me after 6 months of NC? But hasn't messaged me?
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