The Two Gentlemen of Verona

One guy falls in love with a girl, then he likes another girl who his buddy likes but can't have. His old girl gets mad and is disguised as a boy. We get letters to self, presumed sword fights and eventually every on gets together and lives happily ever after.

This is one of Shakespeare's earlier works. It follows a lot of the common elements that are established later. I still find it tough to really get in to.