Orgasm denial is a superb tool to use all the time on your guy, but it is even better when he needs to be punished for upsetting you.
One month without an orgasm is a long time for a guy. And I have found from experience that it only takes one experience of this for him to get the message.
Masturcise him every night and he will be a slave at your feet within days. You can drive a guy absolutely insane by masturcizing him and denying him any release, and it is hilarious to watch him suffering such sheer torture.