I'm not comfortable sharing our bed with my girlfriend's best friend

My girlfriend brought her best friend to live at our house, but I\'m not thrilled about sharing a bed with her. My wife\'s hot and I can\'t resist fucking her, even if it means cheating on her. I satisfy my lust in the bathroom, where I can\'t see my girlfriend\'s disapproving eyes. It\'s a dangerous game, but I can\'t help myself.