That's "coulda/woulda/shoulda" territory, at that spot she did what she felt was best for her friend, she couldn't know she wouldn't talk to her friend for the next 5 years.She should have stopped him right there and then. She should not have waited until after MC ran away.
He literally runs right off.She pretty much did. MC just ran away fast enough before she could react.
It's in the story, we see her trying to talk to him the same day, probably 10 minutes later.Honestly this is one of things I hate about the story wish Nyx found another way to do it. Or at least showed how Erynn tried a bit more to talk to him before he left , by either trying to have Alexis do it for her , get Mel involved or just skipping school to wait for him. Yeah I get she sent letters and what not but just wish she did a bit more.
And then it's explictly stated by both of them that he did his best to keep away from her for the weeks/month he still lived there.
This.Honestly I put alot of the blame on the MC himself rather than Erynn. Even at 13-14 he should have known better than to put her in the position of asking her something so important and personal infront of Lexi and Ethan.
She made the effort to write letters to him, then the little brat didn't even have the decency to read them but tore them up and threw them away. Even if she didn't want to be his girlfriend (which I think she did) they pretty much grew up together and were best friends for years, so I think that he owed her the common decency of reading what she wrote IMO.