Hoovering?

Just a question. I was so good at NO Contact for 2 weeks. We had a huge blowout and neither of us seemed to be interested in ever ever talking again and are separated. Then this past wed. I broke NC (ugh) and knew he had started going to therapy and just wished him well in it, stating I knew were were not close or even friends anymore given the blowout and were worlds apart, however I told him he is smart and intelligent when he wants to be, and will do well in therapy if he really wants to better himself (as he was ALWAYS saying he wanted to do).

There was no response and the Friday at work he just kept staring at me everytime I walked by. So odd as for past two weeks nothing except work, professional contact between us and even then it was strained and tense. Then at the end of the day, an email comes saying. Thanks for the nice note re: my therapy you send via text the few days ago and have a great trip to SC. Seemed pleasant so I responded "I know you will do well in therapy if you put your mind to it." Then he emailed back "have a good weekend" and then a few more nonchalent emails between us.

Now I know after much research what the Narc is about so am treading carefully. Is there anyways you can just keep these people at bay with friendly contact given I have to sit and work right next to this person everyday? I am not sure what this sudden staring and emails are for. I think it was because I paid no attention to him whatsoever these past two weeks and did not let him see me sweat or bothered over the blowout or him yelling at me that we would never be speaking again.

I am also going away for 3 weeks to SC so that could be it. He also emailed me on friday to tell me that he has taken off the exact same timeframe I took off for my vacay but his is for stress leave but he would not say what type of stress. I think he just wants me to worry about him maybe or forget about him while away and get strong.