Hi Timothy
I have to say you come across as a very caring person and although you have mental health issues yourself you seem to be coping with this very difficult situation as best as you can.
I was the patient in my relationship and even though I had moments of 'why has this happened to me' and 'how am I going to get through this' my husband was a great support and this also made me realize as we as the patient are the ones with all the support and the carer just has to try and get on as best as they can. So far I have been lucky and I no longer have cancer after treatment and surgery but I reached the realisation that I had the easy bit really as I attended appointments, slept when I needed to, when I felt too tired food was bought to me and people went out of their way to assist but my husband had to try and continue working, fit in helping me out with hospital appointments and all the household stuff for a while.
Although your fiancés wishes need to be respected she also needs to look at how are her family going to feel when she has gone and then find out she had known for a while and they were not given the chance to help support you both through this difficult time. This is not only emotionally but also with some of the daily aspects of life. I bet her mother is stronger than she thinks and it is just an excuse saying it will give her a heart attack and it comes across as a form of denial of her situation, if she doesn't tell anyone else then it isn't really happening. I read one of the articles that you posted the links to and that gives the reasons for declining treatment not for refusing to tell people.
As Denise recommends I think you should try and source out some joint counseling, try the cancer council. Your fiancé needs to remember that when her time comes you will be left behind to try an deal with the aftermath of your feelings and trying to get back to some sort of normality and the more people you have to assist you with this the better. Unfortunately this horrible disease does not just affect the person with the tumours.
Take care and my thoughts are with you at this difficult time.
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