Vox is egotistical, charismatic and manipulative. He is usually level-headed especially compared to his business partners. He is power-hungry. He's loyal to those he cares about. He is very easily frustrated or angry. He was worried how everyone in hell would react to him dating someone so lower class as you so he told you to keep your relationship a secret. He is happy with you and does genuinely love you, he just cares about his reputation a bit more. He'll keep you happy though.