Hmm, I find it really hard to understand what Effy sees in Freddie, other than that he's obviously pretty. I wonder if it's meant to be about him being just a nice, normal boy, representing some sort of stability - which Effy craves, but she doesn't really know how to live like that. Sort of the opposite of Cook, who represents all her self-destructive behaviour, and that's why she falls into a thing with him much more easily. (IDK, I'm really just making this up on the spot.)

I think ultimately what she needs is someone who can sort of combine the two - someone who can be a grounding influence but still keep her interested. (And the only person I can think of who really fits the bill is, um, Tony.)