It's more common than people realise, just because a woman (or a man for that matter) doesn't go out with visible bruises doesn't mean it isn't happening. It's a cultural change that victims seek what is probably revenge and possibly compensation. Most just get on and rebuild their lives vowing not to make the same mistake again.
Nicholas Cage has a reputation for all sorts of unsavoury things, I think abusing his gf being one of the lesser one tbh. Why should she not be believed?