Arnold Schwarzenegger is opening up about his affair with housekeeper Mildred Baena, which ended his marriage to Maria Shriver.“Remember it’s not like we had a feud,” he explained to People magazine in an interview published on Sunday. “We didn’t have a fight.”He added: “It’s just my f–k up.”The “Terminator” actor and Shriver were married for 25 years before they split in 2011 after the scandal.