Depends on you definition of "wrong" i don't think there's anything wrong with seeing someone at work, just that makes things tricky - hard to maintain professionalism at work, if you have a persona row, not letting that carry into the workplace, if you break up how will that affect your working relationship - or if you break up and he starts seeing someone else at work - how that would affect you etc. IT's not wrong per se, to me, but can cause complications. YOu can stop it but IMO this makes things worse becuase you'll want him even more and maybe you should be together. As the saying goes you shouldn't dip your pen in the compnay ink, which generally is true but easier said than done.