Calling all narc mind readers!

OK...I am doing exttemely well and feeling very strong, but I need a little insight from those of you who may have experienced a similar situation to mine.

You can read more details under the Goodbye Letters "Goodbye MD" but here is a quick recap: Met N at work at a very low point in life. Love-bombed, idealized, devalued, silent treatment, devaluesd, silent treatment, discard, hover, repeat for over a year. Went from strong, confident woman to a weak, pathetic, crazy mess. Spinning, spinning, obsessing, obsessing. Lost friends, unhappy at home, drank, depressed, bad things happen. Began to research and learned he is a textbook N. Cognitive dissonance. Denial. Reading. Learning. Accepting. 4 months ago N quits working at my company!!! New friends, happy at work, happy at home, good things start happening, NC, clarity. Today I was told he is coming back to my company in my department. Spinning, panic, anger. He has so many people fooled. Epiphany: I don't want him to come back. I am not holding on to any false hope anymore. It is only a problem if I allow it to be. He cannot control me or manipulate me again. I am stronger, wiser and see him for what he is.

This is where I need some guidance. Part of me thinks I should quit but part of me thinks this is my chance to have the last word by not letting him affect me. I am an over-thinker and a bit of a control freak, so please humor me on this question: Considering he has made little to no attempt to hover me since he left, should I expect him to try to worm his way back in again? I'm strong, but it still concerns me. Have any of you been in a similar situation?