 JD is dating Danni -Jordan s sister- and that means spending more time with Cox outside the hospital, and Perry doesn t very much like it. Danni tells JD that she is falling in love with him, but gets mad for the fact that he wasn t even listening, and while Jordan explains that even they are doctors they don t listen. When that happens, both JD and Cox realize that the patient -that they didn t know what s wrong with- actually tried to commit suicide.