This week's Grey's Anatomy was a gut-wrenching hour. While the residents were worrying about the upcoming medical boards get the scoop here and Mark was acting as Chief, Cristina was forcing Owen to recall every torturous detail of the night he cheated on her.

Let's check out the heartbreaking and sometimes heartwarming top moments from the hour:

Flashbacks! The episode began with flashbacks to the small, but equally momentous moments in Cristina and Owen's past, from the icicle in her gut to the bowl of cereal she threw in his face. The one flashback we didn't want to see? The night Owen cheated on Cristina at the bar which Owen recalls in detail to Cris throughout the episode. (The couple lies to the hospital and says they've come down with the flu.) It turns out, Owen cheated on her the day after they quit therapy. The woman in question was a friend of his patient. After drinking far too much, the lady convinces him to hook up with her much to Cristina's disappointment as she bawls her eyes out. The silver lining? After Owen leaves, Meredith is there to be her person, sharing a sweet moment on the phone where the twisted sisters sit in near silence, with only the sound of Cristina's muffled sobs in the background.

Outside the hospital! It's not often that we see outside of Seattle Grace, besides the docs' apartments, so it was fun when Callie and Meredith ventured to a park so Callie could quiz her mentee for the upcoming medical boards. Meredith is officially ready, but are the other doctors?

No! The rest of the new Fab Five (Alex, Jackson and April) stress over their upcoming tests and even enlist Lexipedia to use her photographic memory to memorize old cases they can use to study. Meredith decides to take the Torres method and turn it into the Grey method by helping the group study, including, eventually, the distraught Cristina, who worries that her preoccupation with a "boy" will make her fail her boards.

Chief Mark Sloan! Since Owen is dealing with his personal problems, Mark acts as chief in his absence. Everyone is unhappy about it, but can we just say that Sloan looks good in a suit? Mark does butt heads with Derek and also goes toe-to-toe with Richard after the former Chief tries to go over his head. Sloan turns out to be pretty adept in the position could this be a hint? Still, Owen reveals that he never contracted Sloan to help, but rather wanted Webber or Derek to fill in.

Ladies night! Since Teddy has been mourning Henry, she decides to get the girls (Callie, Arizona and Bailey) together for a ladies night. But when each of the ladies realizes they'd rather be having sex with their significant others, they all decide to bail. Realizing they're leaving Teddy out in the cold, they do the ladies night anyways. Who's up for some Beaches?

Sexual telepathy! Wasn't sure it was possible, but apparently Ben has special powers. With Tuck staying over at his dad's, Ben wants to treat Bailey to a special night, but doesn't want to say the torrid details at the hospital. Instead, with one look, he sends Bailey running off to get out of ladies night. Seriously, that man has powers.

What did you think of this week's episode of Grey's Anatomy? Should Cristina forgive Owen? Sound off in the comments.

Wondering what could happen in the Grey's Anatomy finale should some of the docs say farewell? Check out our theories

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