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.