According to Us Weekly, their busy schedules were one of the reasons why they parted ways.
Dobrev is filming “The Vampire Diaries” in Atlanta, while Hough is in L.A. working on “Dancing With The Stars.”
“The distance was too much to handle,” a source told Us Weekly.
The same mag reported in September that Nina and Derek were a couple.
“[Nina] was hanging a lot with Derek’s sister Julianne,” a source told the publication at the time. “Then she fell for him.”
Nina Dobrev and costar Ian Somerhalder separated in May, after three years of dating.