Here is an experience of a man becoming a jw in order to marry the so-called love of his life...I'll let his story speak for itself:
http://www.jehovahs-witness.net/jw/experiences/222940/1/My-Experience
I also got baptized in order to marry a jw man who seemed so sweet and caring. We weren't married a month before he started hitting me. Eventually this evolved into kicking, strangulation, him driving into oncoming traffic...anything to terrorize me. As a jw woman or child, you are strongly discouraged from involving the police in cases of domestic violence and even child molestatiom...I can cite cases to you if you can't find them with Google. But my jw husband was so crazy that his doctors had him forcibly committed to mental wards twice throughout our six and a half year marriage. Despite the rulings of doctors and judges that he was a real threat to my life, the elders insisted I either stay in the marriage or stalk him long enough to determine whether he would commit adultery or murder. You see, there is no remarriage in the Watchtower cult unless adultery is proven; therefore giving the abuser continued control over his victim. I made a false confesson of adultery, divorced him and was disfellowshipped for my trouble. As a result, with the exception of a few requests for family medcal history, I've been shunned by my jw mom for almost 25 years. My brother shunned me for 18 years, but we reaquainted after he too left the cult.
Is this really the type of thing in which you want to be involved? Run, don't walk, my dear. If he wants out of the cult, he needs to take those steps himself. If he does leave, require him to get specialized therapy. Even then, if I were you, I'd also have him sign a pre-nup regarding finances and custody of any future children. Instead of thinking about what you would have to do to be with him, start thinking about the things he should be doing to be with you.