Okay,I really liked the concept of the book, what i didn't like that much are those chapters of "let's make it longer". chapters with no action full with descriptions and romance. 
 the book reminded me of Jojo's song "Safe With Me", it feels like Cassia sings about Xander 
 the song Says: 
 "He doesn't know that I'm kissing another man while he's missing me. 
 He wouldn't see any difference cause my secret is safe with me. 
 I know I shouldn't keep anything from him, but I'm hiding away because I love him. 
 I lock the door and throw away the key. 
 and it's safe with me. 
 He's a good man, he's a good friend. 
 He would never do what I be doing. 
 Don't deserve him, don't wanna hurt him. 
 But if I tell him, he'll leave." 
 Listen from here: https://www.youtube.com/watch?v=wKb6T...