He is allegedly insecure of Efron and feels that working with him might lead to Hudgens calling off their relationship.
His insecurity is so high that he prevents her from talking to Efron off-screen.
According to reports, both Zac Efron and Vanessa Hudgens are very desperate to save their failing careers and that is the main reason why the former lovebirds have decided to do the "High School Musical 4" movie.
In real life, Zac Efron and Vanessa Hudgens met on the set of in 2005, began dating some time after, and broke up in 2010.
Both actors are happily coupled up with other people now: Zac began dating model and entrepreneur Sami Miró last year, and Vanessa has been with actor Austin Butler since 2011.
Whilst we now understand why the pair ended, it doesn’t make the break up any easier to deal with.
And we doubt that there will be a reunion on the cards anytime soon.
Notably, rumors of their reunion have been the subject of gossip right from the time the movie began making noise. He captioned it with a sweet message saying that he was grateful to have found that throwback photo.