I don't see any reports that say he divorced her because of the cancer. Maybe she was just a bitch. However, saying 'everything in my life sucks right now.' because his wife has cancer is a little douchey.
I don't know that there's anything linking the divorce to the cancer, it was just a really easy reason to hate him I don't think anyone ever said because of, just while she had cancer. yeah she could have been a total bitch.