Boys.

They suck.
You love them.
You lust after them.
You share your lunch with them.
They break your heart.
They make you cry.
And they are oh so frustrating.
But that is because they are BOYS.

A MAN on the other hand
 won't suck
 will love you back.
 will share EVERYTHING with you.
 will protect your heart with everything he's got.
 will wipe your tears.
 won't frustrate you but make you whole and life will be easy.
But that is the difference between a boy and a man.
A boy won't, but a man WILL :)