I'm sorry you are hurting with this news.
He did send mixed messages lately, didn't he? Not necessarily that you were getting back together one day, but that he was building a friendship with you perhaps.
I'm sure those "I met someone" words are ringing in your ears.
When you are ready, your turn will come. I'm proud of you for blocking him on FB. I think it's silly for adults to flaunt new relationships on there.
Take care of yourself. Keep moving forward. The best is yet to come!