cali! why on earth would you want this guy back after what you just went through???
are you still trying to fix him? you can't!
how exactly did you part? i think that should explain what to do next.
if YOU need a closure just tell him that, that you need closure and you want or don't want to stay in touch. it's up to you what you want from a relationship, not what he decides - a relationship is about the wants and needs of 2 people, not only his! if your needs/wants match then you will have a relationship if not then it won't work. but don't do it at his work, be discreet about it or you will be the one looking bad.