maybe in 2015 between the filming of the two mockingjay movies? it probably took catching fire for them to warm up and be friends, and by the second movie the foundation was kind of already established? and when she went filming for mad max and man from uncle it was nice to have all these little visits for him (which probably fueled are they/aren't they rumors), but right before the principal photography happened for the last movie they were told to kind of cut it off before they began promoting the film. i don't know how good she'd been at wanting to follow those instructions, so might have still kept casually seeing him during the press tour, but at that point they weren't technically a thing anymore? i'm also thinking of adding her to high life though, so there's another chance for them to work together again.