I respect that that, not that you need rendom internet approval from me.
In my opinion, the most poorly implemented part of the story is the mystery around Summer. Other parts of Nika's life have effectively distracted him to the point that he goes from dreaming about her every night and being a recluse to her just being his weird ex. It undermines the trauma aspect, and makes the trauma side feel like a random lightning strike, rather than a ball and chain he drags around.
Having said that, I expect there will be more therapy sessons soon, and I'm sure we'll get more of a sense of how some of the characters interact via Ayua's fight training. Ocean won't give us a clear explanation for Summer so early in the story, part of the process for NIka will be learning not to hide from it. But yeah, I think the spectre of Summer needed to be more prevalent to give greater weight. Things like, when with Bella, if he kisses her, he has a couple of frames flash back to Summer and he pulls away upset or something. Or when she tries to get something going he freaks out has a panic attack. Nika's basically gone from being conpletely non functional, to balanced and calm, with erratic moments like seizures instead of overwhelming trauma.