People break up for a million different reasons. Even after lasting for a long time, problems can still come up. People can still show a dark side. Or it could be that there has been a problem their entire relationship, and they were both just hoping it would go away with time when it didn’t. There’s a million reasons why people break up.
I agree, it’s hard to find couples that really last these days, but it also depends on the person. I know that over a year is a while to last, but others may think that lasting for just three months is a long time and worth celebrating. Maybe that’s even part of the problem, I don’t know. But we shouldn’t let it get us down, because for every couple that breaks up, there’s one that lasts forever. :)