He is darn obsessive of you, like way off the charts. But since he is cold and ruthless, he denies these feelings. Sure Grima will act all distant to you, but he will secretly stalk you and such. You absolutely don't know any of his bad habits. He is technically both tsundere and yandere, denying his obsessive feelings while also being possessive at the same time. Grima would most likely do everything you say, know everything about you, follow you around, and other obvious signs.