If not he should call the police. Most countries have pretty serious laws for fucking up computer data - which is what she did. We talk jail time here (obviously not - the chars ca nbe restored, so the real damage is low).
And yes, I would do that to my gf. Because basically regardless how I decide to live my life, at the end of the day being the criminal end of an abusing woman makes her not my gf the moment she does something.
I say it's fake. A real wow player would have spent at least one hour looking for his characters, cried a bit, then asked his girlfriend about it and finally hit her instead of the computer...