I have other theory, if i remember good Nika can´t remember a time in his past, maybe he did something to her and that´s why she left?? This would explain the trauma (he can´t remember what he did but the trauma is still there). I prefer the theory of a darker Nami but this can be possible right?
Yeah, he has suppressed memories. He mentions to one of the LIs and to Amber (I could be recalling a different thing though)
And yeah, I think Nami has a dark side or some trauma to process. I joke that any main LI has some deep issue that is going to be worked through alongside Nika's troubles. If the LI is too happy, it is going to be only lewdable. =p
However, I think Nami really did something to Summer that contributed to her kidnapping. Like, if you are feuding with a family member or friend and you receive the news of their demise, I guess you would at least feel something, specially if your last interaction was a fight.
So, I think Nami had a fight with Summer and that was the last time they both saw each other and Nami feels guilty about it. Nevertheless, I also think that she also has another conflict emotion because, I argue, Nami was already in love with Nika when they were kids/teenagers. With Summer gone, she has no rival vying for Nika's attention and I guess she could find some horrible relief about that, making her more conflicted in her role in Nika's life.