Meredith and Derek performed clinical trials on patients with brain tumors. They lost all of their patients except for one whose boyfriend died just before her life-saving surgery. Derek starts a relationship with nurse Rose.

Who does Derek date in Season 4?

Nurse Rose Meredith and Derek eventually break up again, and Derek briefly dates Nurse Rose. The former couple remain professional as they run a clinical trial together.

Who does Derek kiss in Season 4?

Rose Meredith discovers Rose and Derek have kissed, which leads to them breaking up. Lexie suffers an allergic reaction after Meredith makes her breakfast. Six weeks have passed since Derek started dating Rose, and the new residents are competing in a surgical contest.

Are Derek and Meredith dating in Season 4?

Meredith and Derek are no longer a couple but sleep together often. Derek wants more, but Meredith cant give that to him and they stop sleeping together. Derek begins dating one of the nurses, Rose, and Meredith is jealous. Meredith takes a leap of faith and gets back together with Derek.

Does Derek cheat on Meredith Season 4?

Derek begins the series by cheating. He cheats on his wife, Addison, with Meredith. When Meredith and Derek are figuring out their relationship in season four, Derek kisses Rose. Finally, Derek lets one of his interns in DC kiss him when hes married to Meredith.

Do Derek and Meredith break up in season 5?

Meredith and Derek end up back together but then break up when Meredith cant commit. Meredith reluctantly asks Derek to move in, which he does, but Meredith wont kick out her roommates, Izzie and Alex. They decide to get married but give up their wedding so that Izzie and Alex can get married.