Millie is a crybaby, master attention seeker and MASSIVE hypocrite. Yeah, Rosie had a peck on the lips (tops) with Hugo the Bozo, but Me-Me-Millie SHAGGED someone else! Just stop talking to her, not throw a strop and pull a sour faced pout everytime Rosie is within a 100 mile radius. Shes as unlikable as Rosie simply because of her absence of maturity.
Jamie is quite clearly seen as a mug and a joke which is why Hugo Bozo had zero sympathy over Specers betrayal and even encouraged it. That said, I think Louises and Jamies "fling" was a fabrication to create a good storyline because he seems fine with Spencer on Twitter. I wouldn't forgive someone for dicking me like that. Fake and Gay is my verdict there.
This is a really good series so far, despite some characters being passengers, even up to now.