The chemistry between Ian Somerhalder and Nina Dobrev goes so well because they were actually a couple of a number of yeas as they were both shooting "The Vampire Diaries," but things went sour for them at some point of 2013 - and maybe seeing her ex happy every day at work was too much to handle for the actress.
In early January, Food World News reported that the actor had proposed to girlfriend Nikki Reed after less than a year of dating, something that many think was the last straw for the work relationship between Ian Somerhalder and Nina Dobrev to completely collapse.
According to The Mirror, while the whole world was focused on what would happen between Ian Somerhalder and Nina Dobrev's characters on the hit supernatural show, Somerhalder and his fiancée were seen walking around in Venice together in a romantic getaway, looking completely unable to keep their hands off each other.
It must have been tough for Ian Somerhalder and Nina Dobrev's work relationship after Reed walked into the picture, as things moved incredibly fast for the new couple: the "Twilight" actress moved in with Somerhalder after only three weeks dating and already have four dogs, three cats and two horses - though they have no children yet!
According to Hollywood Life, before the announcement of Dobrev's departure from the show was made official, the actor tried to savage the professional Ian Somerhalder and Nina Dobrev relationship, begging his ex to stay on the show for one more season as, even though things would be smoother for him at work if she left, her character is as key to the series as his.
Can "The Vampire Diaries" go on without Dobrev's character?
"The Ian and Nikki relationship caused strain. But Nina was just bored and wanted to start making movies before she gets too old and misses that window," said a source close to the actress, speaking about how much had Ian Somerhalder and Nina Dobrev's former relationship affected her decision - and it seems it may have been the last straw for her!