Hunt won her Oscar for her 1997 film As Good As It Gets with Jack Nicholson.
The actress, 54, and her writer-producer boyfriend Matthew Carnahan, 56, split after 16 years together.
They share a 13-year-old daughter, Makena Lei, born in 2004.
Actress HELEN HUNT has rebounded from her failed one-year marriage to HANK AZARIA - straight into the arms of KEVIN SPACEY.
And despite AMERICAN BEAUTY star Spacey's notorious fear of commitment, pals have told American newspaper THE NATIONAL ENQUIRER he's fallen head over heels in love with Hunt.
Ben Lewin’s awards-tipped indie drama stars John Hawkes as the poet Mark O’Brien, who was paralysed from polio in childhood, and Hunt alongside him as Cheryl, a professional sex surrogate whom he hires to help him lose his virginity.
The story of their relationship, which unfolds over six paid encounters (the sessions of the title) is a thorny, frank and searchingly intimate pas de deux that echoes two other films about disabled writers and the women who love them, My Left Foot and The Diving Bell and the Butterfly.
Helen Hunt and Matthew Carnahan have broken up after 16 years of dating.
"She has been split up with Matthew for several months.
The Los Angeles native has won four Golden Globe Awards and four Emmys.