It depends on how much open communication you have. Some people can be very clingy and always not understand what you say. That kind of people are the ones you need to stop communication for approx 3 months. But if you have open communication and a good agreement when you broke up, you can just continue to be friends immediately. Both situations happened to me in the past.
What I mean by good agreement for the break up is that you both understand what the other person wants and dislikes in the relationship. Also, you are both very easy-going to talk about serious issues but, at the same time, have clear personal guidelines about what is unacceptable (e.g. after the break up, do not call each other with nicknames like "honey").
If you constantly received empty promises from him in the past, then it is better to just have no communication for a few months. Any constant unreliability in the past or nagging means you will have difficulty finding a good agreement. The maximum you should do is tell him to fill his life with good things to do, just once.
Both of you should do more good things like visit friends, travel, or learn new things. Just occupy your time and maybe someone else who likes your new interests becomes your partner.
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