Calling the split "very amicable," a source blames both of the stars' busy schedules for the demise of the relationship.
"They spent a lot of time apart because of work and it was difficult on their relationship," a source says.
And clearly, both are keeping busy with their respective film careers.
Hoult in particular is currently filming the sci-fi drama Equals in Japan, where he was recently snapped getting sushi with co-star Kristen Stewart, 24.
The Warm Bodies star and Stewart will play love interests in the Drake Doremus-directed film, which is described as a "futuristic love story set in a world where emotions have been eradicated."
Hoult and Lawrence began dating in 2011 after meeting on the set of X-Men: First Class, but broke up in January 2013, reportedly because he was uncomfortable with Lawrence's intense fame following her roles in Silver Linings Playbook and The Hunger Games franchise. However, the two rekindled their romance in July 2013 after filming X-Men: Days of Future Past together.
Interestingly enough, Hoult was reported seen last week "snuggling up" to his Mad Max: Fury Road co-star Riley Keough at a New York City party -- who was also memorably linked to her Runaways co-star Kristen Stewart's ex Robert Pattinson in 2013.