The 27-year-old England international says he was upset at having to fend off constant rumours about his future during the summer, as he continued his recovery from a serious knee injury.
He told The Mag: "I have only ever said positive things about Newcastle and always been 100 per cent committed.
"Whenever I have been doubted I've always responded the best way I know by scoring goals. But I'm stubborn and won't be bullied into saying things.
"I don't feel I should keep coming out every week and saying I'm loving this, that or the other.
"My management company used to get phone calls from boardroom level saying I haven't done this or I haven't done that, or we want more interviews on this.
"But when I'm injured I just put up a shield and take the abuse and remember who said it."