Generally it takes a long time of hardship to maintain a teenage
relationship to a good ending. There are just too many factors at
work that can de-rail a relationship at such a young age. Money,
studies, NS, maturity, parent relationship etc etc.
From my own observation of 10 teenage relationship I only saw 2
success cases. They know each other from Sec 4 until they graduate
from Uni and get married is a total of 10+ years. That is what I
called teenage relationship progress to hubby and wife
ending.
So in general, teenage relationship don't last long and it is law
of nature at work I guess 
