For me, my decision to leave came very quick. It had been brewing for years. I wanted to either sink or swim, I was sick of being a "weak" one. So I asked the elders to approve me for a study and they assigned a pioneer to me. It was the first time I took the studies seriously at all- including looking up "worldly" scholars quoted by the society, lexicons, etc. We only studied a few weeks, then I went from "I want to study" to "I'm leaving". I'm sure it took my husband off guard.
He asked why, and I didn't try and convince him of anything. I used "I statements" kept it about me and how I felt, and avoided placing blame. I talked about what I felt lacked in my childhood and how I wanted different experience for my kids. I said how I had always been so unhappy as a witness and that at this point I didn't care if I died... but that I just wanted to enjoy the life I had in a positive way. I pointed out his grandparents who have given their life to the organization and how unhappy they seemed. The end hasn't come in their life time, and that I didn't want to give my life waiting for an end that might or might not come. I'd rather live the life I *knew* I had, and if I died, I died. I didn't see the point in trying to convince him that the end wouldn't come. I think I even said something about how even being a JW doesn't secure me from not dying, I have to always give 100% of myself to preaching and studying to really assure me a "spot". "I just don't have it in me" I told him.
I tried to keep doctrinal debate to a minimum and chose carefully and worded my objections as questions. He tried to answer my questions, but ended up asking me to talk to some elders- which I obliged. I was careful and "meek" in my delivery and asked questions- very careful not to outright say I didn't believe.
My feelings hadn't changed after doing what he asked so I told him I couldn't continue to go, but that I would continue to support him in going and we could work out the details on how often the kids could go. I pointed out his other grandparents (one believer one not) and my grandparents (two different non-JW religions). I made it clear that I supported him, and always would... and knew he would support me as well.
I told him repeatedly that I loved him and that I wanted to let go of the religion, but NOT him. That above everything else, I wanted to keep close to him through this. That the only thing I couldn't stand to lose was his love, which was true.
I know not all will get an answer so surprising from a believing mate, but after the shock wore off and acceptance came in, he decided to leave with me. He didn't enjoy meetings enough to do it alone, much less alone with kids. It kind of shattered his world, because he had always hoped he'd marry a pioneer to "carry" the family spiritually. I guess in his heart he wasn't much of a believer himself. He had rarely seen one partner leave and not have it eventually tear them up... so he left with me. That wasn't what I wanted, honestly... I didn't want to be his reason for leaving.
I won't lie, the next couple years were a real trial for us. We didn't quite know how to relate to the world, how to make friends, how to thrive outside the confines of the organization. I'm sure there was some bitterness to me for taking away our social structure and his family in a big way. It took us awhile to find our feet. He eventually has come to his own conclusions about the organizations and no longer regards it as a truth... but it was his own journey, I didn't push it on him.