Zac Efron and Lily Collins have reportedly split after dating each other for just three months.
According to sources, neither of them was particularly serious about the relationship.
"They're no longer together. They were never serious, though; it was just a casual thing and it fizzled. They were never in the same place at the same time," Contactmusic quoted a source as telling Usmagazine.com.
"Zac was never very serious about her. He didn't talk about her to friends," another source said.
The Lucky One actor and the Mirror Mirror star were spotted together in February for the first time, but both being private people, they were photographed together only once.
Another friend claims that their tough schedules for filming and promotion of their respective films were keeping them apart.
"It's true that their schedules are crazy right now, which isn't conducive to a relationship being easy," the friend said.
The 24-year-old actor, had previously been in a relationship with his High School Musical co-star Vanessa Hudgens for five years, and has also been linked to Taylor Swift.
Efron, on a previous occasion has claimed that he loves the feeling of being romantically attached to someone, even if it doesn't work out.
"I enjoy romance. I think that's why we're here. It's one of the best feelings you can have, falling in love."
"It doesn't always have to work out, but when you're in it, it's still the best feeling in the world," he said.
On the other hand, Lily, 23, has previously been linked to Taylor Lautner, her co-star in Abduction.