[s12e23] At Last -

Her refusal to marry Alex sets the stage for the reveal of her "Paul Stadler" backstory.

Give you a breakdown of the to see how these cliffhangers resolve. [S12E23] At Last

: Meredith decides to sell the house Derek built (the "Dream House") to Callie and Penny, as she feels she is finally ready to move on from that chapter of her life. Major Character Developments Development Meredith Grey Her refusal to marry Alex sets the stage

Detail the from the show following this arc. [S12E23] At Last

This episode directly sets up the :

It establishes as the primary event.

Explain the and why his arrival was so controversial.