I can't believe that this is true. The words used are abrupt. They convey a sense of shock and paralysis. They convey the same sense of helplessness that is later echoed in My Empty Room , although the character feels initially only shock, as helplessness has not settled in quite yet. I don't really think that someone can really expect someone else to say goodbye before they are murdered.
Murder is, by definition, unexpected.
Nikki is not thinking logically now, and the lyrics portray Nikki's attempt to regain his tough exterior and to accept fatalistically this turn in his life, his attempt to deal with the shock. I Don't Believe in Love is an erratic, frantic, piecemeal, shattered song. Yet the words, in some cases, are rather simple. But the aggregate of the simple words and the simple constructs form a large metaphor for the state of the character's mind. He's lying to himself, he's avoiding, he's blaming, he's franticly crawling for a conclusion that he can come to.