Misunderstood

I don't understand
Why love can feel so good and be so bad
Why friends can turn to foes
Why happiness doesn't last forever

But most of all
Why relationships often fail
Why peace after war never prevails
Why working hard doesn't always help
Why sometimes it's hard to find oneself

What I understand most is
Why heartbreak and pain doesn't last forever
Why sometimes we face stormy weather
Why everyone can't be trusted
Why loving is often disguised with lusting