You really love this guy, don't you? I don't what to tell you.......
I am an ex-jw, I too once tried to go back to the hall. I was able to give it up when I saw how judgemental and cruel the elders can really be. If he goes back and is shown love- he will probably stay. Plus, there is alot more at stake here than just you and him. It's his children! With most people the bond you have to your child is so strong that you are willing to go to the ends of the earth for them. Just like some people stay married just for the kids excuse. Maybe this is that for him. As if he is willing to sacrifice his love for you, just to have his kids happy again. But rest assured, he will be miserable. I can't say if he will get back with his wife again, but everyone around him will push it. If he's smart he'll go back to you and forget this nonsense about being in a cult and hope that one day, when his children are older, they will understand. But it's very hard to lose everyone on the face of the earth that you ever knew. I'm sure he loves you, but he has lost everyone. Hopefully, this time away from you he learns that sometimes you can't go back. He wants everything to be the way it was, but happy with you and those world's don't mix.
If you really want- you can talk to the elders. But they will only get you out of the picture or try and convert you. If you are not converted, you are not acceptable. If he continues to associate with you after knowing that you don't want to be converted then he won't be looked well upon and it may hinder his getting reinstated. And whatever you do- don't tell them that you are posting on this forum. They will try to convince him that you are Satan's ploy to get him away from god and his family. Boy, I hope that helps in understanding a little bit more of what you are dealing with.
If you are married, then they would really try and convert you! I don't think you want to do that though. Let him come back to you. You know that stupid saying- if you love something let it go and if it comes back to you it's yours. If he comes to visit you just let him talk, see how he's really feeling. But if he really wants you back, he will want to move back in with you for the way that you are and not expect you to change. Like- this would be so perfect if only you were a witness.
Well- good luck with everything. Things usually turn out the way it was supposed to have happen. And just because you are broken up now doesn't mean you always will be, he may have a change of heart. But whatever he does, go on with your life and be happy. Don't let his life decisions affect your life and happiness. Remember this is a fresh cut and tomorrow you will feel a little better. Lots of Love.