Los Angeles: Actress Nina Dobrev is reportedly "heartbroken" over her former boyfriend Austin Stowell and Emma Stone's romance. According to entertainment website Celeb Dirty Laundry, "The Vampire Diaries" star was upset when she heard the rumour that her ex-boyfriend dated his "Battle of the Sexes" co-star, reports aceshowbiz.com. The site also claimed that Dobrev's "unbearable heartbreak" caused her to plan a return to "The Vampire Diaries" to "hide the pain". Stowell and Dobrev called it quits earlier this year after seven months of dating. They broke up reportedly due to their conflicting schedules. Though they are no longer a couple, they are reportedly on good terms with each other.