Crossed

I'm really intrigued by the world that has been created here. But the actual story and characters are just too unbelievable and frustrating for me to finish this book. So many things don't make any sense to me, here some examples:

Why does Cassia insist on destroying all her valuable artefacts? Can she really not hide or trade them?

Why must she use Xander to get to Ky? I get that she wants love instead of her best friend, but then just let him go easy instead of using him achieve the opposite of his goals, very mean since he is just lovely.

And if Ky is so damn smart then how did he end up in this dangerous situation? Why did he send himself to a place he knew he would likely never get out of alive and crush his remaining family's hopes and dreams in the meantime?

Please let me know if logical answers to these questions are given later, then I might just pick up the books again ;)