Plot summary
Cooper gets jealous when he finds that Charlotte has kept a picture of her ex-husband. Violet finds that she's being sued by Katie because of all the information that she put in her book. Addison and Sam butt heads when it comes to a patient who faces the decision of giving birth to her baby at twenty-five weeks or letting her cancer spread. Violet decides to go see Katie and ask why she is suing her, which enrages Pete. Cooper goes to find Billy, Charlotte's ex-husband, so he can see if there are any old feelings left.
When Billy talks to Charlotte, he confesses that he's gay, and that he never meant to hurt her. Sam and Addison contemplate whether or not to break up, because of their differences over having a baby. Violet finds out that Katie dropped the lawsuit, but now the medical board is reviewing her license and she could lose everything.
Credits
Adapted from Wikipedia contributors, Private Practice season 4. HTML formatting and reference markers removed.