Zac Efron has refused to speak about girlfriend Vanessa Hudgens as he fears they may break up. The couple began dating after meeting on the set of their movie ‘High School Musical.’

“I don’t want to be another 20-year-old actor talking about my relationship,” he said. “I want to keep that private – sorry. All I can say is that Vanessa’s a great girl. And I’d hate to say more about it because by the time this interview comes out; it may or may not be relevant.”

Meanwhile, the pair has signed on for the third installment of the High School Musical. The movie is set to be released later this year.