He wasn't doing fine. It was obvious he was annoyed right from the beginning - he even said so himself.
Also - has everyone forgotten that they didn't actually say anything bad about Chantelle? They quoted from her book, and if the book was not rubbish there would have been nothing funny about it. The bits he read out just sounded like an the mindless thoughts of a bimbo - sorry to be harsh. They didn't
need to say anything else.
Another point - Preston doesn't like his wife being humiliated - yet he had no problem publicly humiliating his (then) girlfriend when he was on Big Brother by blatantly flirting with someone else. The words pot and kettle come to mind. And he's quick enough to criticise other people in the public eye...if he can't take it, maybe he shouldn't dish it out.