i've tasted going back to an ex, and i've tasted trying to fix a relationship before it breaks off. I highly recommend focusing on your career, praying to God everyday and going to sleep before 9 PM.
Let them miss the version of you they abused. Don't go back to prove you've changed. Don't update them. Don't respond. They didn't lose you by accident, they chose behavior that made keeping you impossible. That consequence is permanent. You are not a lesson they get to revisit.