Love, Lust, or Crush?

You know how people throw out I love you all the time?
I bet you anything, half the time they didnt mean it
If they did, why do so many girls cry over guys?
Why are there so many divorces?
I was taught love lasts forever
And ever and whatever happens after life
I was taught, if both the people has died, they were reunited in heaven
Hey, maybe it was just me
But I think love does last forever
Maybe you simply just had a crush
Maybe you were in lust
But if you break up with that person after a few weeks
That isn't love
I mean, who would ever say I love you after only a few weeks of dating?
How do you know if you actually love them?
Whats the difference between crush, lust, and love?
Love lasts forever
But you dont know itll last forever do you ?
Lets just say
Love is a feeling that lasts forever and ever