Carla brought up the Watchtower terminology I forgot about, i.e. "unbelieving mate."
That is the true problem. As a married couple you cannot work through your differences on equal footing. The Jehovah's Witness leadership is constantly cutting in with rhetoric regarding "unbelieving mates." Much of this comes in the way of life stoires, where the Watchtower details how blessed a family has become after a spouse's decades long battle in converting their "unbelieving mate." The lessons most JWs learn is that even if it takes decades (yes decades), they should remain forever faithful to the organiztion because eventually unbelieving spouse will "soften" to the "kingdom message."
This, of course, constantly undermines any work the unbelieving mate does in forming compromise within the marriage. Why relax your standards when you believe the person will eventually convert to the faith? Watchtower rhetoric inadvertently encourages a callousness towards people outside of organization because they are "part of satan's world." Compromise is seen as defeat for god and victory for satan. Its a battle between good and evil, and its smack dab in the middle of your marriage.
To answer the question, if I'm better off without him? Yes. Is he better off without me? I think yes too. He would be free to marry someone from the KH who believes just as he does. They could get all dressed up in suite and tie, dress and stockings and go to meeting like one big happy family. My daughter I fear, would stay completely immersed in a doctrine that's destroying her mind.
Seems like you have made your decision.
Is your son currently being raised a JW?