"They have taken a step back from their engagement for the time being but they remain close," people.com quoted a source as saying.
They had been dating for several years prior to the engagement as they had been romantically linked since 2013.
Greenwald joined Larson at numerous awards seasons events that year when Larson received recognition for the 2015 thriller "Room". She even gave Greenwald a shout-out while accepting the Academy Award for Best Actress at the 2016 Oscars.
"Jacob Tremblay (has been) my partner through this in every way possible," she said of her "Room" co-star.
"My real partner, Alex Greenwald, I love you," she added.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)