Derek chooses Alex Karev as his resident instead of his wife, Meredith Grey , arguing that their personal connection and Meredith’s family history (her mother, Ellis) would make it too emotional.
Mark finally confesses the pregnancy to Lexie Grey . Lexie, feeling like Mark is starting a second family without her for the second time (referencing his daughter Sloan), walks away from the relationship. [S7E13] Don't Deceive Me (Please Don't Go)
Alex quickly realizes he is not suited for the patient-facing emotional labor required for Alzheimer's patients. In a surprising moment of growth, Alex tells Derek to hire Meredith, acknowledging she is the right person for the job. Derek chooses Alex Karev as his resident instead
In a lighter subplot, attempts to modernize the hospital by live-tweeting surgeries for educational purposes. Alex tells Derek to hire Meredith