It never works out that well though. Yes, breaking up with people sucks. But it is exponentially better than continuing a relationship you're no longer invested in, for everyone's sake. Otherwise, you're either going to hurt them much worse down the road, or hurt yourself by staying in an unsatisfactory relationship forever. At the very least, you're wasting however much of their time it takes for them to figure out what you should have told them as soon as you knew it.
Dammit. I think I just realized tomorrow's going to be a long day