I'm such a sucker for a happy ending that most likely I wouldn't, that's probably limiting me though bc I've been blindsided by a death of a character before as a reader and ended up enjoying the story the more so for it. But it has to be done incredibly well and if it's hinted at early (prologues set in current time with stories that "flashback" with main character deaths or even break-ups or general sadness put me off too)... There's actually a story on here by an author I really enjoy that began with the main character being alone and trying to move on from a break up and as soon as the story flashbacks to discuss the relationship -- I found it very hard to hear all the wonderful, shiny moments of the 2 characters so I put that story on hold to read later (maybe when it's completed so i can peak at the last chapter to see if they do get back together! )