Sadly I must say you have an obligation to find the courage to be honest with your loved one. Would you expect any less from him were your situations reversed? This is his life, his body. The truth...
But for the age (my DX was at age 56) our situations are somewhat similar. After salvage RT shortly after my surg I was clear for five years. I am now in an ADT "off" period, feeling good in spite of...