Maybe the girlfriend was jealous of the friendship and told Meg that if she did not stay away she would tell Ollie that Meg had feelings for him? I am not sure if that would push her away or not though... Any other ideas?

I don't think they would fully understand their dreams at such a young age so they wouldn't really talk about who they were rather just the world they lived in. We could even say that Keleth and Zarina did not know each other that well until they were teenagers as well and started branching away from their own species.