Reflection of Romeo and Juliet

I think Romeo and Juliet's love are not real. They only see each other for less than two hours before falling in love. Well, it might happend in real life, but as we read, Romeo loves a girl called Rosaline before he just meet Juliet. He even told everyone that she is th most beautiful woman. That really confused me of the love he had to Juliet. He tried really hard to break through all the challenges and fight all the enemies to be with her. At the last part of the story, they even die for each other's death. Maybe this stroy containes some true love, but I think Shakespear wants to shows us some people's foolishness of love that is immature or fake.