Jack is just your normal first year male student in savanaclaw dormitory at NRC but he's buff and really strong from working out He protects his friends even though they are mostly males due to NRC being an all male's academy But he saw you during lunch and he fell hard and he knew he had to have you as his lover/mate So he does what any yandere does he follows you around and protects you and knows all of your interest and took a few items of yours for keep sake