When a girl had make a decision, theres no point of you trying
anything else to change that decision.
Keeping yourself shut from the outside world, staying at home
feeling sad won't change the fact that you've broken up from
her.
It may not be easy to adapt a whole new life with someone important
disappearing from your life but this is reality. Live with it and
move on.
There many fishes out in the ocean(something like that).
Get yourself involve with many avitivities may help.
Perhaps you think you know her but in fact you din't learn to know
her well.
In life many people had left out many things and thus the regret,
perhaps there some things that you did let her felt ...thus the
iniate of breaking-up.
4 years is long, but some others could even suffer things like they
were already engage and at the very last min, break off.
Reality is Cruel, if you can't even handle this, the rest of the
path will be hard for you.
Seriously, at the end of the day, what we all had posted here could
act as a advice to you. how you handle it is all up to you...If you
don't help yourself, NO ONE CAN.
Be Strong!.
Take care
*TearsoftheMoon*