Breslin shared this personal information as a part of National Sexual Assault Awareness and Prevention Month - which President Donald Trump announced he would support last week.
She was once the victim of a sexual assault.
The former child star also featured the comment as a pinned tweet, and has elicited a number of thoughtful responses from fans as a result.
Breslin, who is set to star in ABC's upcoming TV remake of the 1987 classic Dirty Dancing, has received an outpouring of support and love from fans on social media since opening up, and took to Twitter on Tuesday to thank everyone.
Take Sarah Hyland and Debra Messing, for instance. Messing took to Twitter to share a message that read: "I love you, Abbie". You're strength and testimony means so much to too many.
"My boyfriend in high school sexually abused me for a year". If you do not want to perform that sexual act in that moment-if you haven't explicitly said yes-you have not consented to doing that act.
Numerous commentators praised Breslin for starting the hard discussion and allowing other women to share their experiences. "I was 17. I'm now 24 and I'm just now realizing what he did to me was abuse".
"Thank you for sharing this".
Actress Abigail Breslin attends the 20th Century Fox party during Comic-Con International 2015 at Andaz Hotel on July 10, 2015 in San Diego, California.
Thanking fans on Twitter, Abigail wrote: "So beyond thankful by the enormous support regarding my IG post last night".
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