first of all cancer is NOT a death sentence.i went thru hodgins disease with my ex wife 18 years ago,she's healthy and well today.one of the most rewarding experiences was our involement with a cancer support group.feeling your "feelings" with a group of people who are/where you are at is a very powerful dynamic.i encourage you and your BF to seek out a group.
it may be premature to mention this now but as the years go by you may find this chapter of your life very rewarding and empowering,giving you tools that make life a bit easier to handle.i wish you both the best.