Just to let you know, my mother is a JW, my father isn't. I had a bit of a conversation with my mother last night. To get into all the details of why they don't belong together would take up pages. I know that my mother is unhappy staying with him. Personally, I think they would be much better off if they were to split up.
My mother keeps on telling me "The truth keeps this marriage together". Yesterday, I came up with a good question to come back with. After she told me this, I asked "What is the purpose of this marriage staying together?" She just told me that it's all for me, and she wouldn't want to put me through a separation or divorce.
My personal belief is that people should do whatever they need to keep their lives satisfactory and happy. I think my mother would me much happier if she were separated from my father. The "Truth" keeps people unhappy.