The RISK here is you picking up the phone from the first stage of him missing you.
If you want him to REALLY want to come BACK you need to HOLD OUT longer than six days.
you need to reject calls for like a month or two.. until he REALLY sees you mean BUSINESS and he can't just call you up, get his fix and run away again.
I am fearful right now that you will fall apart at the first phone call or text he makes...
Don't get hooked on contact iwth him right now.. the contact isn't healthy for you.. its as much a drug as any other... you are giong through a withdrawal of sorts now too...
once you are past that, and you can ignore the calls by choice knowing they aren't good for you THEN you are in a healthy position to challenge him mroe... but right now this demonstrates how vulnerable you are right now... high risk fo breaking NC.