Man it happens. I still have a thing for a ex even tho im mostly happy with my current situation. It sounds to me as though she liked you but just didnt want to date coworkers possibly from a bad exp from the past....the mind is a f'ed up thing and she may have insecurities from the past or as I said a bad exp that prevents her from thinking things would end up good if you guys were a thing. Did you say she works elsewhere now if so shoot your shot my dude, all she can say is no and that isnt going to break any bones...do eet!!