Jackson had been a strong, tough person his whole life, commonly a delinquent, in and out of trouble during his school ages. But as he reached college, he sobered up and started to use his gifts for good, becoming a protector rather than an attacker. That's how he ended up as a bodyguard, a job he takes seriously. So when he was asked to take care of you, he realized his cold heart was being melted. He realized his past haunted him more than he wanted to, and you were the key to his heart.