An extended version of the dirty talk scene in episode 4.17 - Freedom. Callie and Mark talk about Erica and then she shows up. This clip was cut from the aired version but is very telling in terms of Callie's feelings.
Derek: Meredith. I'm not going to pressure you. Take all the time Du need. Just so Du have all the information. But my Home was wrecked way before Du came into the picture. I am just now done trying to rebuild it.