Ansel Elgort says he reunited with Violetta Komyshan because he "knew something was missing."

Ansel Elgort and Violetta Komyshan

Ansel Elgort and Violetta Komyshan

The 'Fault in Our Stars' star, who recently rekindled his relationship with his high school sweetheart following their split in August, admits he didn't really enjoy being single during their five months apart.

He said: "I was doing OK, but I knew something was missing, and I was like, 'Oh, that's love.' "

The couple split because of Ansel's busy working schedule but reunited in December after realising how much they "missed" one another.

A source recently said: "They just missed each other. He thought his schedule was too much to have a girlfriend during, he's been touring nonstop for movies and working on music, but they talked throughout. He didn't really see anyone else seriously while they were split."

The 20-year-old actor shot to fame in the 2013 'Carrie' remake alongside Chloe Grace Moretz and Julianne Moore, but claims most of his friends initially thought he was crazy for choosing Hollywood instead of going to university.

The 'Divergent' star told Details magazine: "I hadn't even graduated from LaGuardia [High School] yet. I could tell everybody who was saying, 'You're making a mistake, go to college,' that I wasn't making a mistake. I missed graduation to shoot."