Most Helpful Guy
Sounds to me like he broke up, had some time to think about everything and realized either that misses you or that he was wrong to break up with you in the first place. Maybe during the whole month he was debating whether to contact you or not? Seems like he's desparately trying to get you back - which explains why he really isn't leaving you alone
Most Helpful Girl
Ignore him, so much mind games there. This guy knows you will respond. He is testing the waters of your emotions. He did the no contact and then sent you a message to see how you still feel. Next time he texts you don't respond. The courage you will garner from seeing how strong you are to ignore him, will either make him curious or realise you're not waiting around for a text.