The 25-year-old, who became an overnight star in 2008 after landing the role of Robert Pattinson's sister Alice Cullen in "Twilight" series, said that her hectic work schedule makes her relationships fleeting, reported Daily Mail.
"I'm always here and there - everyone in my industry is - and that's why a lot of relationships are fleeting. I've gotten very good at detaching whenever I have to go away for three months, which I realize is hard on friends and kind of selfish.
"After the movie came out, some people said, 'You changed'. And I said, 'I haven't changed, dude. Your opinion of me has changed because I'm working on this film.' Trust me, my parents would let me know (if I changed)."