It was recently announced that Burton and her co-star Chad Michael Murray are to leave the show after six series, a move which Burton described as "an emotional decision".
Speaking to Entertainment Weekly, the actress - who played Peyton Sawyer in the series - said: "There really wasn't a lot of turmoil. It was a fabulous six-year run, which is how long my contract was for, and I feel really lucky to have been a part of the show."
Burton also said that the decision to depart was not a rash one. "A lot of thought, emotion and kindness was put into it," she said. "I will never say a bad word about One Tree Hill. The entire shape of my world changed because of that show, so I'll always be very affectionate toward it."
Discussing Murray's exit from The CW's teen drama, she added: "He's very compassionate toward the show and the fans. It's not an easy decision, but we've got to be grown-ups sometimes."