I did not like Keiran at first. The whole 

"I'm gonna be mean to her just to get a rise out of her even though I've had a crush on her for years" thing just doesn't work for me. Especially when he made that little "joke" to a reporter thinking that it would be all good. In the end he did grow on me.

I like Cherisse a lot as a character. No complaints when it comes to her.
Hated the 

third act break up especially because Keiran acknowledged multiple times that he needed to tell her the truth and still didn't. But the ending was satisfying.