15 Alex Karev Moments That Prove He's the Best Character on Grey's Anatomy

Stressed out about Derek's mysterious lab colleague in DC, Meredith believes she was distracted and killed a child in surgery, blaming Alex for making her doubt herself. Alex hugs her tightly, telling her she did her very best in their surgery together. There's no doubt Alex has become Mer's person after Cristina left, and he'll continue to play an important part in her life after Derek's passing.