Book Vs. Film

The biggest difference between the book and the film in the end of the story. In the real story (the book), Romeo kills himself with a poison and Juliet, when see that Romeo is dead, kills herself with the Romeo's sword.
In the film, Romeo thinks that Juliet is dead so he kills himself with a poison and then Juliet kills herselelf with Romeo's gun. The end of the movie is too tragic because Juliet see how Romeo dies and meanwhile he's dying he's seeing how Juliet it crying for him.
The truth is that I don't like the movie, and I would like to read the William Shakespeare's original story.