I blocked his numbers from being able to call my phone, which helps a lot, because if he called me I would answer it. (Now I don't have that option).
I will confess that after his constant calls in rehab, driving me crazy, trying to control my life from inside rehab, I was sick and tired and ready to move on, so in that sense, me not initiating contact is easy. Not replying back, that's hard - thankfully he hasn't emailed or called lately, now if only he would stop his monthly unwelcome "visit".