What is the theme in Torch Song Trilogy by Harvey Fierstein?

Betrayal is a central theme in Torch Song Trilogy, since much of the play focuses on Ed's betrayal of Arnold's love. Ed loves Arnold but cannot accept his own homosexuality. In a very real sense, Ed betrays himself as well. He hurts the person he loves because he feels he must live as a heterosexual, fulfilling his parent's expectations. His betrayal of Laurel is also an issue, since he leaves her emotionally, long before he physically leaves their marriage.