"Apparently, I lost you."

Callie and Arizona stood face to face, neither making a move or saying a word. Finally, Callie had enough, picked up her coat and stormed out, letting the door slam behind her. Arizona could only look on helplessly, her head slightly downcast.

Callie had started back to the pit when her paged sounded, the room number foreign to her, but she walked in the opposite direction to it anyway. Back in the lounge Arizona had stood frozen until her pager had stirred her back into reality. She looked at the number and finally emerged from the room only to be confronted by Lauren Boswell.

"Arizona, can we talk?"

Arizona sighed. "What we did, what I did, was the biggest mistake of my life. There's nothing to talk about. I don't want you. Please, just leave and never come back."

Arizona walked away from the woman she cheated on her wife with and arrived at the room number on her pager to see the back of Callie entering the room. She stopped, took a breath and steadied herself before she walked in.

Arizona noticed Callie standing over by the windows not really looking at anyone as she turned to Owen to find out what was happening and to admire the latest addition to the hospital family. As she and Bailey fawned over the little one, Owen started telling them about the situation in the ER.

Arizona glanced in Callie's direction but she wouldn't meet her eye. Arizona tuned back into the conversation as Callie finally turned her attention back to the others instead of the lovely wall she'd been staring at.

"And the bad news?"

Owen continued on. "Everything else. The blood bank is flooded and the ER looks like it was ransacked."

Callie stood quietly, her arms folded as the rest of the board talked about shutting the ER before Avery entered the room and announced the airport was re-opened and he'd put Dr Boswell in a cab. Callie's eyes flashed with hatred at the mention of that woman's name. When Cristina innocently asked who she was, Callie couldn't help what escaped her mouth.

"She's the woman Arizona slept with last night."

The room was eerily silent, no one knowing what to say while Arizona's face gave away her guilt as well as the shock that her wife would announce her infidelity to the world.

Callie unfolded her arms and walked towards the door. "If you'll excuse me, I have patients."

Callie decided she needed to get out of the room and away from her wife before she said or did something else she'd regret. As Callie walked behind a shocked Cristina and towards the door Derek spoke up.

"Before you leave Cal, the board needs to make a decision."

Callie stood poised at the entrance of the room before she turned back. "Oh, actually you might but I don't. It was made abundantly clear to me last night I wasn't on that plane so I probably shouldn't have a say or be on the board either. So do what you want, I just don't care anymore. In fact, I resign from the board, effective immediately."

Callie turned on her heel and strode from the room and to the stairs, her hair and coat swinging in the breeze she created as she walked away. Callie decided she needed a moment to calm herself before she worked on a patient so she took her time getting back to the pit. Back in Meredith's room, everyone was staring at Arizona and only Cristina was bold enough and brash enough to say what everyone was thinking.

"You stupid bitch. How could you do that to Callie? Do you know what she went through with George and Izzie? Callie might not have been on the plane but she lost plenty too."

Owen tried to interrupt. "Cristina, I don't think this is any of our business."

Cristina turned and gave Owen a look before she continued. "You dumb...you know what? I can't even be in the same room as you." She turned back to Owen. "If we need to close the ER, I say do it. If you need me, I'll be making sure Callie's okay."

Cristina stormed away to find her friend as the rest of the board stared at Arizona before Meredith broke the silence.

"So, I'll call our suppliers and see if we can keep the ER running."

Owen nodded as the rest of the board made plans and suggestions while Arizona stayed as silent as Callie had been before she dropped the bomb on her. Owen and Avery left the room while Meredith started to make phone calls. Derek gently ushered a still quiet Arizona from the room and into an on call room.

"What happened Arizona?"

Arizona sat on a bed and sighed, her head in her hands. "The biggest mistake of my life is what. I cheated on my wife. I'm a cheater. Oh God, I've lost her forever."

Arizona's tears flooded down her face as Derek sat beside her and put his arm around her shoulders.

"I admit I didn't know you and Callie as well as I should have until recently but if there's one thing I've known about Callie for a long time is she has a big heart. She's hurt right now and obviously pissed off. Let her cool down and then sit down and talk. I'm not saying it'll be easy, but it's a start."

Arizona looked back up at Derek. "Cheating wasn't the only terrible thing I did last night. I yelled at her about not being on the plane and that I should get a saw and cut off her leg to even the score. And then I told Callie I trusted her more than anything and she let me down. That she didn't lose anything, I did. Then she said, 'Apparently I lost you.' What have I done?"

"Let her calm down and talk. You both need help and the only way that's gonna happen is if you talk."

Derek hugged a crying Arizona until she calmed down. "Come on, let's go and see if we can help in the pit. It'll keep your mind off things for a little while."

Arizona nodded and let herself be led out of the room. She stopped at a bathroom to wash her face and take a deep breath before she faced patients, other staff and especially her wife. Arizona arrived at the pit to be confronted by a scene of chaos. Owen hadn't been kidding. Arizona grabbed a chart and walked over to help the first patient she could.

Callie was in the store-room finding as many bandages as she could while Cristina hovered around her.

"Are you okay? Do you want to talk about it? Callie stop."

Cristina put her hand on Callie's arm to stop her movement. Callie sighed and leaned against a shelf, her head throbbing and her eyes sore from crying. She put her hand over the bridge of her nose and pinched.

"I don't want to talk about it." Callie pushed herself off the shelf and headed to the door. She turned back to Cristina. "Besides, there's nothing to talk about. Arizona and I...I'm pretty sure we're over."

Callie walked back into the pit, leaving behind a shocked Cristina and back to the patient she was dealing with when she noticed Arizona with Dr Murphy. They looked to her like they were trying to set a man's hips back in place. Callie handed the chart to the nurse with instructions to clean and bandage the wound and walked over to her wife and the intern, putting fresh gloves on.

"What's happening Murphy?"

Arizona looked at the helpless intern and back at her wife. "Looks like a double dislocation. Could you help me click them back in place?"

Callie sighed but moved Leah out of her way and took a hold of the sheeting they were using to reposition the hip bones.

"On my count. One, two, three."

A sickening sound came out of the patient as his hips realigned themselves back into their sockets. Callie tore off her gloves and turned back to Dr Murphy.

"Push two of morphine for the pain and let me know when you can get me in the OR and let me know if his status changes."

Callie scribbled a note in the patient's chart and started to walk away, Arizona following close behind.

"Callie, wait. Please. Talk to me."

Callie turned back and gave her wife a look that could melt steel. She pointed an accusing finger at her wife. "No, you don't get to do that. I can work with you to help a patient but you don't get to hold me hostage to plead your case. You said everything you needed to last night."

Callie walked away from Arizona for the third time in a day leaving her wife stunned and heartbroken in the ER. Arizona knew it was now or never. She followed Callie into the store-room and shut the door.

"No. We need to talk Callie. I know I hurt you and you're pissed right now, but we need to talk."

Callie stood, her arms folded over her chest again as she met her wife's eyes with her own. "I'll make this real simple for you Arizona. You fucked another woman in the place we work. You probably wouldn't have even told me if I hadn't caught you and then you unload everything on me. I'm to blame for everything that's wrong with you. Well congratulations, if you wanted to get me back, you succeeded. You win. I'm done."

Arizona's eyes pleaded with Callie's. "No, don't say that. We'll get help, I'll go to therapy. Don't say we're done."

Callie sighed and looked at the floor before she focused back on Arizona, making a decision. It might have been hasty, it might have been rushed, but it was all she could think to say in that moment.

"I want a divorce."