When they were young he pushed Chased from a height that almost killed him. Chase has a pet bird and when it died Grayson said its just something easily disposed. Basically he is part of the group who bullied chase physically and emotionally to the point that the emphatic and emotional Chase thought he is the one wrong for having feelings. When Chase had his first rut the lost memories and Grayson told him he slept with a dog, hence why Chase has trauma. Chase also dont like going to "parties" but he always force him to spend his rut there.

I never liked Grayson since i saw him in kiss me liar and kiss me if you can. I still hate what he did to young Chase. I understand that he has mental issues and his family is to blame but i just cant like him. Still i hope for his character development.