As I expected,
Felix's anger was a big fat nothing burger. Sure, he gets mad, but he immediately walks it back into them both being at fault. I'll say it again: I miss suspicious Felix.
Aside from that, this line from Felix's perspective stood out to me:
That was foreshadowing, but the question is 'what is it foreshadowing?'
Is it foreshadowing a bad end for Sophie or a bad end for Felix where he is shown to be completely wrong about Zack as a person.
Either one is possible, but the second one would make me roll my eyes so hard I'd do a fucking cartwheel. Not a fan of the whole 'womanizer suddenly becoming a loving and faithful partner' trope, but to each their own.
Also, if you had told me at the beginning of this story that Amy, of all people,
would actually begin to feel guilty about the part she played in Sophie's 'awakening', I would have laughed at you. Though I could be wrong about that; we'll have to see.
Lastly, I notice a couple of mistakes in this release. The most notable one was a clear inconsistency between Felix and Sophie's perspectives: