Nope, definitely not
But a solution to most of these problems would've been replacing the scene where Naomi was on the phone laughing like she had the time of her life with one where she instead looked sombre or thoughtful. Other than fuel the question whether she was actually talking to her mum or not, there wasn't much purpose to it and they could've used this scene to subtly show us what Naomi felt about the situation without having to shift the focus from Emily.

I think Sophia violated Naomi's privacy by stealing her stuff, but I don't think she's to blame for Naomi cheating.

Don't you know that two girls being in a relationship automatically means that they are all over each other's business? It comes right after moving in together as soon as possible and being super-dramatic about everyting on the lesbian to-do list. Heck, they are even called Naomily, so much for individuality. ;)

Oh bb, we care so deeply for this stuff that I feel slightly uneasy that the likes of Jamie Brittain are in charge of breaking or mending our hearts. Why did I get invested in this?