"Vampire Diaries" fans are still in shock from the big reveal of Nina Dobrev and Ian Somerhalder's break up. With the dust settling over the jaw-dropping news, many are now questioning why the on-screen and off-screen couple called it quits.

It looks like fans of the couple won't have to wonder what drove the split. Life & Style magazine spoke to a source close to 24-year-old Dobrev who claims that commitment issues were the root of their problem!

"He was starting to talk marriage and she is just getting started on her career," the insider explained. "She loves him, and they still talk every day, but she is not ready to make that huge commitment yet. Maybe in 10 years."

Dobrev's commitment problems to 34-year-old Somerhalder isn't much of a surprise. The pair have been battling engagement rumors since they made their relationship public three years ago. One rumor that has circulated is that Dobrev turned down a proposal from Somerhalder a fear years back.

Just this past September the actress told Fashion magazine that, "eventually I am going to marry and have a family but not anytime soon." She added, "I'm not going to pull a Miley."

The pair have a little break from each other while "The Vampire Diaries" takes a summer hiatus. Somerhalder is traveling the world before filming for the fifth season of their hit CW series begins, telling fans on twitter, "Packing - off to China! See you soon! Then NY, Spain, Canada, Russia, Hungary, Italy, France, Brussels, England (for movie) then back to NY then ATL 4TVD."

Dobrev was just photographed in New York attending the 2013 Met Gala.

The split between Nina Dobrev and Ian Somerhalder was first reported by Us Weekly. People magazine confirmed the break up.

Also check out:

Nina Dobrev Splits From Ian Somerhalder: 4 Signs The 'Vampire Diaries' Couple Was Headed For A Break Up

'Vampire Diaries' Season 4 Finale Spoilers: Does The Ian Somerhalder Nina Dobrev Split Reveal Delena Break Up In Episode 23 'Graduation'?