Thanks for your responses...
No it's not the same guy, anvilhead! but yes, it is a deja vu from the last time I came here. You are right in that he needs to stay as a coworker and someone away from my life as possible... can't really do No contact though...
But yes, I won't give him or anyone at work my personal number! I have felt so much better without work-related drama or being contacted outside work hours.