Love, a thousand questions with no answers!!!!!!!

Why if love is supposed to be so beautiful, sometimes it makes us feel so horrible?
Why if it is the best feeling in the world, sometimes it makes us feel the worst?
Why if we want to live to love and to be loved, sometimes because of love we will like to die and even to kill?
Why if love makes us see birds and butterflies everywhere, sometimes it turns us into monsters?
Why if love can make us be so sweet, it can also make us be so bitter?
And why if love makes us suffer so much, we want to fall in love all over again?

Why, why, why?????

Finally, it is better to fall in love or out of love?