Sometimes, only sometimes we don't expect to fall for certain person, not because we are uncapable of loving again but because we are completely convinced that that person isn't even close to our idea of our perfect match. And although you try as hard as you can not to get caught up with that person, somehow it ends up happening, somehow love invades you in every single way possible and then that person has you. It wasn't expected, you weren't trying, you didn't want to but now that person has gotten your heart and now everything you do or feel relies upon them. You become vulnerable. That's love for as far as I know.