GREY'S ANATOMY - "If Only You Were Lonely" - As Adele's condition continues to deteriorate, Richard considers altering their living situation; an explosion at a local coffee shop results in a busy day in the ER for the doctors; Callie takes Meredith under her wing by helping her study for her boards; Lexie joins Arizona and Alex in peds, as they continue to care for intern Morgan's premature son; and when Jackson snaps at a patient, Mark encourages him to find ways to relieve his stress. Meanwhile, Cristina lets her suspicions get the best of her, on "Grey's Anatomy," THURSDAY, FEBRUARY 23 (9:00-10:02 p.m., ET) on the ABC Television Network. (ABC/VIVIAN ZINK) AMANDA FULLER, JUSTIN CHAMBERS