Well, something that is huge to one person (a 12 year old) may not be huge to someone else (a 15 year old). Besides we've seen now that the MC only remembers the negative aspects of what happened. We've now seen it from 2 perspectives and I wonder if we will eventually see it from the perspective of each of the participants. To the MC it was a horrible moment, to Alexis it might have been the first time she realized that he was a sweet kid, who knows what Erynn and Ethan were thinking at that point. Maybe Erynn was embarrassed but felt reciprocal feelings she was trying to deny and, perhaps, Ethan was jealous of the fact that a 12 year old kid always got Erynn's attention (IIRC the MC described Erynn and himself as best friends).There is definitely a lot that still needs to be unpacked with what happened between then and now. Hoping for an explanation on why Erynn seems to have forgotten what happened between them, I mean she acts like they were still best of friends when he moved away. Honestly starting to think she is obsessed with him but there is no real explanation for it to date.
We could even see it from the perspective of Emily and/or Melissa since they could have been watching from inside the house..
If you could look back at your life and pinpoint one event that changed it, especially if it was the abrupt departure of your best friend, wouldn't that cause you to think a lot of "what if"? What if the MC had never left? Would he have advised me not to become a model? (Etc)
For all those people who are saying they want nothing to do with Erynn, this game isn't going to let you break it off with the MC's former best childhood friend, daughter to your mother's best friend/next door neighbor. The best we can do is not pursue her romantically and hope she doesn't fatal attraction us...