Discuss the ending of Tyler's work The Accidental Tourist.I was left confused.

The ending is subtle, but highly effective.  The moment
that Macon tells the cab to pull over and pick up Muriel represents a couple of things. 
The first is that he is willing to put aside the self- destruction and emotional
emptiness of his past and embrace the insecurity and passion of the future.  Macon's
relationship with Sarah was stable only its penchant for his destruction and his self-
hatred.  In a sense, Macon had become used to living his life in a suitcase of self-
loathing and emotional frigidity.  There was a comfort, a cadence to it that was
appealing, on some level, to Macon because of its familiarity.  With Muriel, there is
unpredictability and intensity, and this is a reflection of the irrepressible nature of
emotional contact.  It is here where Macon has to make his fundamental choice.  There is
guidebook for this world with Muriel.  There is only feeling and learning with each day
being different from the previous one.  It is here where there is a certain level of
challenge for the pattern driven Macon.  When he breaks free of this by telling the cab
to pull over, instead of following its directed path, Macon indicates that he is willing
to embrace this new and unpredictable world. From the isolated and passive world of
emotional frigidity, Macon proves that emotions are important.  While they are
unpredictable, they prove to be the only element that prove one's vitality and capacity
to accept life.  It is here where Macon is at the end of the novel, and why he
presumably gets back together with Muriel.