What happens: At the beginning of season two, Addison, Derek's estranged wife, ends up working at Seattle Grace, and Derek is uncertain about signing his divorce papers. Meredith's love triangle with Derek and Addison eventually ends up being one of the smaller dramas in the grand scheme of Grey's Anatomytragedies. But that definitely doesn't take away from how sweet this moment is when she confesses to Derek how much she loves him and implores him to choose her.