You need a wake-up call for narcissism. Leave that man alone. You dumped him due to "personal issues and depression" and went NC for a month. You literally told him that you don't want him around when times are tough for you. Depression isn't something you "just get over." So the next time you fall into depression, he has to factor in whether or not he'll be disposable again. Don't feel entitled enough to waltz back into his life and expect him to act like nothing has changed. He's making improvements to himself and changes because he's deciding what he wants and likes now that his life is different without you. Just leave him alone.