I can understand your not wanting to be 'the girl who made him leave The Truth™.' As your relationship moves forward, please be aware that there can be times when he will be enticed to return, such as when you decide to start a family - unless he is well and truly OUT, he may feel that his children's lives depend on him going back, and taking the children to JW events so that they can have a relationship with his JW family.
Think about this too: He was willing to sneak around behind his parents' backs for a year before they even knew you existed. While it really can be impossible to be completely honest with JWs (because they judge your decisions and try to make your life miserable), it's really important that you get him to understand that you don't want those kinds of secrets in your relationship with him. He's developed a habit over the last year of lying to some of his closest family members and friends, and I would hate to see it carry on with you at some later point in your relationship with him.