This has a SPOILER, but considering almost every other review mentions it, it's not really.
You kind of sell the whole "woman scorned" thing short in this case because he leaves her physically disfigured, as one of her most striking features is literally shorn off her back while she's drugged. Angelina has stated that it's a clear allegory to rape, and I think most viewers will agree without having to be told.
Like it or not, women are victimized like that every day--all over the world. What's worse is that they often receive no justice, or are even blamed for whatever crime has been perpetrated. There's also the fact that what is done to her is a war crime. Maleficent does what some women have, and gets her own justice, however twisted the method in this case. I think that deserves a mention.