Look carefully! A decree isn't something you get when you graduate. That one little letter change makes it something else altogether: a legally binding command or the announcement of such a thing.
If you go back far enough, a decree referred to a decision handed down by the Roman emperor. In more modern usage, a divorce decree is the document issued by a court that terminates a marriage. And if you want to go out with someone on a date, but things keep preventing you from having the chance to ask, you could say that fate did not decree it to be so.