Romeo & Juliet - Love at First Sight

I definitely  not believe in love at first sight. I don't believe in love at first sight because I have never experienced it , not that it is real, but I also don't believe in it because I don't think someone can just randomly fall in love with someone in just one sight.  Romeo and Juliet's love is not sincere because Romeo had just said that he wanted someone else and now all of the sudden he see's Juliet and he falls in love. I do not believe in love at first, I don't know why but I don't.