How did he not know who you were? Was iy messenger chat or something?

I know you are hurting, I really know believe me
It's hard to cut all contact with someone you feel a connection with... As much as we know you would be better off in the long run to well... run and never look back. I can't give you any advice as I am struggling at the moment with the "need" to delete Lou from my FB but can't bring myself to cut it off...

Is there a chance you can change jobs? Move to a different place inside the company etc?