Describe Forrest and Jenny's relationship in Chapter 4.

Forrest runs into Jenny at the University of Alabama and learns she is a member of a folk band. Forrest begins playing harmonica in Jenny's band. Things are going pretty good between Forrest and Jenny until he finds her having sex with the banjo player in a car. Forrest assumes that she is being molested, so he pulls the man off, but Jenny is furious and Forrest is fired from the band.