Girl because he is. He doesn't only sweet with his partner like the other characters in this series, but he also sweet the others. You might not see it yet if you only read kmiyc and kml, but believe me, Grayson is a sweetheart. Bliss is on the top but Grayson is the second in that. Mind you, he doesn't have empathy like Chase but if you compare the both of them, Chase has never help or tried to understand the people around except for his partner and his partner's family, while Grayson who doesn't have empathy, tried his best to help the others and has been trying to understand the others. That's the irony of this universe.
im not saying anything about his personality, I can't come up with an opinion cause obviously theres not much to go off (and i haven't read the novel), all im saying is that I interpreted this persons comment as meaning that he is the sweetest Grayson compared to the Graysons from the other series and that was why my reply was that hes the same person!!! And that if I was wrong then my bad

Poor grayson got raped and dumped. And he was the sweetest too, out of all the series