After finishing the novel in three days, I can honestly say his character development was so damn satisfying. I loved the moment he finally understood what emotions really meant, and the amusement park scene hit especially hard. It's honestly difficult to hate him after reading the novel—his growth throughout the story completely changed how I saw him.
I never hated him. Sure, I want him to clash hard with Dane and for Dane to give him an incredibly hard time. But we can't really hold him to the same standards of normal people. Gray doesn't understand common sense nor feelings. His head is clearly broken. And we are now finding out his parents managed to break all of their children but Gray because he was born already broken.
And I have been curious about him since Kiss me liar

Wowww. Everyone's opinion about Gray suddenly flipped here... We all hate him in Kiss Me If You Can, right? Now y'all loving him here? Now I wanna I know why! Hahah
So excited to see him suffer too with Dane hahaha