Stanley views Blanche as being untrustworthy due to her snobbish attitude towards him and her many questionable traits. Being a man of reality, Stanley wants the truth behind Blanche's false image. .
Blanche has created a fantasy world for herself because she has refused to accept the reality of her life. Williams is showing how one may create diversions in an attempt to relieve oneself from the stress of life. Williams is demonstrating this through the lies that Blanche is living. He is showing the weakness of a person placed in an uncomfortable situation. For Blanche, this is the situation she found herself in while in Laurel, after the suicide of her husband. She attempted to block out the feelings she had for him by seeking physical pleasure. This desire for physical relationships brought her to a more troubled state of reality. Thus, she continued to live a lie, by attempting to leave her troubles and stay with Stella. Through Blanche's actions, Williams is showing the vicious cycle that can occur when one attempts to run away from reality. He is demonstrating the dangers associated with becoming engulfed in things that are false. He is showing how one will become involved in more trouble by trying to escape reality, rather than facing it.
Stanley eventually finds the truth behind the fiction that Blanche has created in her many fantasies. By researching Blanche's past life, he was able to uncover what she was running from. Stanley's ability to uncover the truth of Blanche leads to her final downfall. The act of Stanley unveiling the real Blanche represents the act of reality overcoming fantasy. Williams uses this act to represent the final showdown between these two extremes. A person is only able to survive in his fantasy for so long. Eventually, the person will be forced to leave his fantasy and return to reality. In this case, Stanley represented reality chasing fantasy and defeating it.