Dang, Mayu's in a rough spot.
Her new guy friend is honestly a really nice person, and would be a great boyfriend.
But it'd be cruel to both of them for her to accept his confession while she still has strong feelings with Haru. And she'd be risking a friendship.
But Haru is so far away, and Megu is clearly going for the kill.
Hopefully Mayu will be able to see him before either of them commits to another relationship.