It's about two families, the Montagues and the Capulets, Romeo and Juliet each from one of these families (I've forgotten which) and they fall in love at a ball, their love is forbidden and they must meet in private blah de blah. Romeo is 'poisoned' Juliet, devastated, stabs herself, Romeo wakes up, sees Juliet, and stabs himself. Cheery man old Bill Shakespeare
Shakespears original play is the "real"original story, although reaize that its a made up story.
Yeah, it's a fictious storyline but it's based on the concept of forbidden love.