To Be In Love.

What does is mean to be in love? Does it mean to know nothing, and to fall in blindly? Do we understand what it's like to be in love? Do we even notice it, or does the rest of the world find out before we do?
To me, falling in love is more scarier then...well then falling off a cliff. Cliffs are a lot less scarier because if you're lucky, there will be water, and you can swim in water. If you fall in love, then there's a risk of no one catching you, and then you become sad and broken.
I'm afriad of love, for the reason of being broken. I don't want to be broken.
To be in love, I guess is to put all of your silly little cares aside and to want to open yourself up to someone. And I guess at the end of the day, being in love is caring about someone. Sometimes you care about them more than they will ever care about you. Sometimes, you become upset that they have left you. Hence the Twilight Saga, Bella Swan, please. Jacob was so much better for you. Love is something that changes, but never ceases. You can love multiple people, but still never fallen in love.
But what does it mean to fall in love? Do we have to only fall in love once in our lives, then we will be good? Can we fall in love again? What is all this mumbo jumbo? I don't get it.