While Larson generally liked to keep her relationship private, while accepting her Best Actress Academy Award in 2016 for her performance in the Lenny Abrahamson-directed Room, the actress gushed about her then-boyfriend.
"My real partner, Alex Greenwald, I love you," she said.
She further told Entertainment Tonight in 2016, "Oh man, I mean, he's the other half of the equation—how can you explain support? I mean, it goes beyond anything. He's just my person, he's my best friend."
The pair are yet to formally address the split.
This article originally appeared on marie claire Australia.