Simon Cowell isn’t leaving the house without a pep in his step, that’s for sure! Former Pop Idol contestant, Gareth Gates, has spilled serious goss on the judge’s office, and it’s all about self-love. The X Factor judge may have got into arguments for being so honest during his panel days, but when it comes to his own space, self-love is everything. Simon Cowell has written an affirmation on his mirror… Simon Cowell writes affirmation message for his own eyesSimon Cowell had written an affirmation on his office mirror during the Pop Idol days. Gareth Gates, a former contestant, told My Dirty L…