Is it breaking NC if...

Hello,

Is it breaking NC if I contact him to tell him not to contact me again? I don't want to open a can of worms.
I'm on Day 6 NC. He left a voicemail not saying anything much except he is starting a new job tomorrow, still has a cold (like I'm supposed to be deeply interested, concerned and fascinated with his life after he abruptly and hurtfully dumped me) and said that we could, after all, get together and chat about the whys of our break up. He said he wanted to see if I had blocked his number (probably should) and that he "cares deeply" for me (not buying that). What's the point now? Sometimes I feel that I didn't get to say and ask everything I wanted to but I know my chances of getting an honest answer is almost nothing. And he will not care what I have to say anyway. That lack of closure is a little hard after 3 years. My feeling is just leave it alone. I don't want to fool myself into using an excuse to break NC. It helps me to keep NC when I say to myself, "He doesn't care about you. He left you. He is probably with someone else. He is making a fool of you. He is false." And of course, reading here every day helps tremendously. I feel myself goig back and forth though. After a few days maybe I will have more clarity. Should I just leave it alone?