Does it make any degree of sense whatsoever that you should come back BEFORE he's doing all this wonderful stuff he's promising to do?
It's just a hook to reel you back in.
Look, breakups are hard. If you run back every time it starts to hurt, it never really ends and you never get a chance to heal. I suggest you BLOCK the texts, go through the pain involved in ANY breakup, and then you can start to get on with your life.