It cant be though because it was all recorded on a phone call and on body worn cameras by the coppers who went there. Things cant be deleted and just ignored, and they are used to record things for exactly these circumstances. Plenty of victims down the years will have been coerced by abusers to drop charges, though not in this case, but things cannot just be disregarded as you suggest. The fact that he was fast asleep when smashed across the head with something will be the reason the CPS were running with this, with recorded evidence of her going mental at the scene.
It is a terrible tragic shame that he was unable to cope with this, and as others have said that will probably be because it is unreconcilable with the image on telly and in the social media stratosphere that celebs have to maintain. It is very sad.