For seven years, Arnold Schwarzenegger hid a mistress from his loving wife Maria Shriver — and hours after learning The ENQUIRER discovered his sordid secret, “The Terminator” terminated his run for governor of California.

The brazen actor began his affair with former child actress Gigi Goyette when she was only 16 — and even made love to her in the very same hotel where he was staying with “Dateline” star Maria.

A bombshell ENQUIRER investigation — featured in our issue that hits the stands Friday — has exposed the whole shocking story, including how the father of four hid the trysts from his family.

Several months ago the muscleman-turned-actor emerged as a leading Republican contender for governor of California — but earlier this week, after we called his representative for comment, the star made a surprise announcement that he won’t enter politics until his youngsters, ages 3 to 11, are older.