Finding out you only have a year to live is no small pill to swallow. Not only do you have to grieve the end of your own life, but you also have to break the news to your friends and family, while dealing with all of their feelings about losing you.
Given the straight-up existential toll, and the limited remaining time, it completely makes sense for someone with a terminal illness to live their final year spontaneously, completely unfocused on their impending death. But there is a line between not wanting your illness to take the center of attention, and completely hiding it from those closest to you.
"AITA for not telling my wife that I am dying?"
"Male, 31 here. For the past 15 years, I’ve been dealing with a medical condition that requires constant medication and consistent doctor’s visits. I had always been projected to live until 50-60ish, however, a recent complication has cut that down to 12 months, 16 at best. In about 10 months, my condition should start getting a lot worse. After 12 months, I’ll essentially be living in the hospital."