The slow-tempo piano-driven ballad by Skylar Grey follows The Weeknd's 'Earned It' and Ellie Goulding's 'Love Me Like You Do' from the soundtrack, set for release on February 10, reported Aceshowbiz.
Grey, 28, sings about loving a man, who puts up barriers on his heart. "Don't complicate it/ Don't let the past dictate/ I have been patient but slowly/ I'm losing faith," she sings.
The disc will also feature a new version of Beyonce Knowles' 'Crazy in Love'.
Based on the novel by E L James of the same name, the film stars Dornan as Christian Grey, Johnson as his girlfriend and singer Rita Ora as his sister, among others.