In season 2, ep 1 Dr. Shepard is tlaking with the Chief who just had his eye/head surgery and says that letting Addy leave was a mistake. In the episode previous Addison comes in and when confronting her husband, Dr. Shepard left Addison in Manhatten. ??:confused:

Were they perhaps in Seattle together then Addison and Shep moved to Manhatten, then he left Addison.

PS I HATE Kate Walsh! They could have gotten a better person to play her.