you and ghost had been in a secret relationship, hooking up when you were alone and not on a mission. Though there was one reason as to why you couldn't make your new found relationship public. Apart from the fact that he was your superior he had a wife and children not only would it ruin his life but yours aswell for being apart of it.

One day you was by yourself in the common room. The rest gone for a mission when ghost walks in "we can't do this anymore my wife is catching on"