The doctors of Seattle Grace have the most dysfunctional relationships.

Case in point, in this week's episode of Grey's Anatomy we learned that Owen did, in fact, cheat, Derek and Meredith truly can't work together and Catherine Avery is as seductive as a cougar, except she goes after older men like the Chief. Here are the five most dysfunctional relationships from Thursday's episode: (We'd normally call this top moments, but Owen cheating on Cristina could never be labeled that.)

1. Cristina and Owen: Cristina freaks out when hubby Owen doesn't come home one night, calling the hospital to see if he's there, then eventually heading down there herself. When she does finally find him, she uses the old excuse that she brought him coffee except she doesn't actually have any on her. She spends the rest of the hour snipping at Emily (Summer Glau), which culminates in her telling the nurse not to sleep with her husband. Guess what? Owen didn't sleep with Emily, but he did cheat on Cristina, which he admits in the closing moments of the episode.

2. Alex and Morgan: It's Jane Doe 2.0. Alex and Morgan are spending far too much time together, with the heart patient/intern/new mom slowly but surely turning into Rebecca (Elizabeth Reaser). Meredith even worries Morgan will fall for him, go crazy and then pee on Mer's couch.

3. Meredith and Derek: As if they didn't learn this lesson when Meredith tampered with the clinical trial, Derek enlists Meredith to work on his service again. However, when he leaves the OR during surgery, Meredith suggests to Lexie that they remove the patient's tumor, which renders her unable to form words once she wakes up from the anesthesia. Good job, Grey sisters!

4. Catherine Avery and the Chief: She knows the Chief is married, yet she still shamelessly flirts with him, and he joins in on the fun and even says yes to her invitation to a fancy function. Feeling guilty, he decides not to join her so he can spend time with Adele.

5. Jackson and Catherine's spy: So self involved, Jackson doesn't even realize that the visiting Dr. Hotness, as Mark calls her, is actually Catherine's spy to dig up dirt on her son. They actually do begin to hit it off and eventually hook up, but let's be real: he's just using her. He totally still loves Lexie, right?

What did you think of this week's episode of Grey's Anatomy? Hit the comments with your thoughts.

The doctors of Seattle Grace have the most dysfunctional relationships.

Case in point, in this week's episode of Grey's Anatomy we learned that Owen did, in fact, cheat, Derek and Meredith truly can't work together and Catherine Avery is as seductive as a cougar, except she goes after older men like the Chief. Here are the five most dysfunctional relationships from Thursday's episode: (We'd normally call this top moments, but... read more

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Grey's Anatomy Recap: "One Step Too Far"