From what little i watched Kate came across as a controling and manipulative woman. She also liked to belttle Jon at every chance she could. Jon finally standing up for himself meant the end of the marriage. He wasn't going to put up with her demeaning behaviour anymore.
Frankly, I think Kate would be a very difficult person to live with. I highly doubt any man worth his salt would want to live with a controling woman like that.
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