Yeah, going back and seeing this with a pre-Yu version of Ayumu's childhood friend is a little vertiginous.
As I think of it, though, while anime!Ayumu is more extreme in her actions than SIFAS!Ayumu ever is, I think she hides her jealousy better? Like, you catch other characters — I think Ai and Karin, mostly — teasing her about acting jealous in the game, and nobody really picks up on her tells in the anime. Hmm.