The couple, who bonded over their shared passion for art and film, had their engagement fizzle out shortly after the press tour for the movie concluded last summer.
Sources close to the pair revealed that their differences became apparent once the project wrapped up.
Insiders revealed: "[Kravitz] and Channing are opposites, but they always bonded over their love for art and film, and that is what held them together.
"Once the project ended, they realized they were on different pages with what they wanted"
The sources claim the romance "fizzled fast" after their press tour wrapped, noting the wedding planning put "a lot of pressure" on the relationship.