Here's the Unbroken conspiracy bingo:
Davis is alive
Zaina is alive
Anastasia is alive
Elspeth ordered Zaina's killing
Zaina is alive and she sunk the ferry Davis was killed in.
Anything I've missed?
On a serious note, now:
I don't think Valentine just turned his back and went his merry way, after seeing Zaina was killed. I'm quite certain he would've checked. I mean, any man would have.
Well, I don't think it's schizophrenia either, but it looks more and more like it. And although I'd take a mental health professional's word, over my guess all day long, and even though STWA makes his homework brilliantly (I mean, there's even an Adair Clan in Lowlands) I don't think he'd be this good. Still, PTSD is way more probable.
We may disagree on this but I think Valentine shouldn't aim to go back to his old self, before the incident with Viridiana. He was a teenager for Pete's sake. People change a lot, especially once they are out of puberty. Valentine actually never let himself to find who he really is, because of the Vi incident, and jump right into the military. He really don't know who he really is and he is afraid to find it out as well. So I find being with Vi and trying to go back to a past that never actually happened is the worst thing he can try to do. I'm not sure what your reasoning behind it but I disagree.
First of all, Viridiana knows old Valentine, but she doesn't actually know at present. Even Elspeth said the same thing to her: So much time gap, especially in youth days makes a lot of difference. Then Viridiana actually confesses Ines that:
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She only compares Valentine with old Valentine and she tries to push him to being that. Besides, she has an ulterior motive to drag Valentine into his old self. She's in love with old Valentine. And since she was not even a teenager back then, her idea of old Valentine is distorted.
Besides, trauma buddies can't be healthy, at all! They will keep reminding each other that exact moment. Viridiana's scars do exactly that. Valentine even said it himself. Accepting and moving on is one thing, but having to be reminded constantly about it is something entirely different.
Honestly, not because of her personality, but because of their shared history, Vi is literally toxic for Valentine.
And I don't think Els is jealous or intimidated by Viridiana. She doesn't even mind their shared history and Vi knowing Valentine for so long. She even gives Viridiana advice, depending the route you're on. Els knows exactly how to deal with Viridiana. She keeps saying "she reminds me of my young self". She even pushes Viridiana to talk to Valentine about her feelings. How is this jealousy?