Not necessarily, but think about it: you’re given a month left to live. 30 days. Does it make any sense to spend time and energy being bitter and angry, and spend some of that time on people you dislike so that you can get revenge after you’re dead (and thus won’t even be around to see)? In my opinion, you have to be miserable to even entertain the possibility vs spending all the time you have enjoying yourself and saying goodbye to the people you actually do love.