being a creeper isn't based so much on actions as it is intentions. For example one may act a certain way from time-to-time but their actions don't match up to their overall intentions. Creepers have their own intentions from the get-go and their actions only gradually make them obvious. Whereas someone might do something creeper-like on occasion but not have the intentions of a creeper.
I cant tell if this guy is just hitting on me if his hes just creepin
its hard to tell until his true creeper intentions come out