There was Zac Efron and Austin Butler, and in between the two, there was Josh Hutcherson.
Released in 2012, the movie started filming in late 2010 and through 2011.
It was during their shoots in Hawaii and North Carolina when the actors became romantically involved.

“Oh, boy.
I don’t know if ‘dating’ is the right word.”
The host caught the two stars off guard when he asked how long the couple had been going out.

They did a double-take with each other, then Hutcherson replied, “We’re not.
We were at one point, but she broke my heart.”
He then quickly added, “No, kidding.

That was a while ago.
We’re just really good friends now.”
Hudgens confirmed, “We’re really good friends,” and patted him on the cheek.