The Tall Guy (1989)

Dexter King (Jeff Goldblum) plays straight man to unpleasant comedian Ron Anderson (Rowan Atkinson). He falls in love with Kate (Dame Emma Thompson), a pretty nurse he meets when he is receiving injections for hay fever. When Anderson fires him, he acquires the title role in a musical stage version of "The Elephant Man". Kate dumps him when she suspects he is having an affair with a fellow cast member, and he must win her back.