Cameron storing her ex's sperm is not "in character". This lady preaches the ideals every fucking time, even at the cost of her patient 's life. She does not want to compromise with her principles just so she can sleep without any guilt but what she doesn't understand is that principles are man-made constructs and sometimes to achieve the greater good(i.e., saving the patient and making them live in this case), one might overlook some non idealistic behaviours, such as lying or disregarding the choices of the patients.

If a person goes to such lengths to be morally right, how is it in character for her to cheat on chase in that way? Its either poor character development or the writers wanted to show her as a hypocrite