A/N: This chapter took a lot longer to write than expected, Mark is just so irritating. So apologises. Please review!

As Callie heads out the front door she realises that she needs to call Meredith to warn her. Thankfully, Meredith picks up.

'We have a problem, I told Arizona that I'm not pregnant and Mark heard. He's on a war path. I'm guessing he's heading to yours.'

Travelling down the elevator, Callie fills in Meredith on how much Mark knows, which is essentially everything. Hanging up when she reaches her car, she heads in the direction of the Grey residency. Callie begins to wonder if following after Mark was the best idea after all, but she's going now. Callie prays that Arizona will still be there when she gets back.

XXX

Reaching the house, Callie sees Mark screaming at Avery. Jumping out of the car she attempts to help Alex restrain Mark. Avery is blocking the doorway, stopping Mark from entering the house.

'You stole my girlfriend. And slept with her. If you think you are going anywhere near MY kid, think again. Get out of the way, I need to talk to Lexie. You mean nothing to her, just some quick fuck.' Whirling on Callie and Alex, he continues to make accusations blaming everyone about this situation but himself. Callie and Alex struggle to restrain the older man.

Mark finally breaks his restraints and makes a dive towards Avery, swinging his fists and attempting to bulldoze him out of the way. But before he makes contact, Avery gets a right hook which sends him stumbling backwards. Callie and Alex again reach forward to restrain Mark. Groggily, Mark again tries to speak. However, Meredith cuts him off and talks to Callie and Alex.

'Get him out of here. He's just upsetting Lexie and getting a coherent sentence out of him will be impossible now.' Callie and Alex wrestle Mark back to her car and push him in. Alex asks if she wants his help, but she just waves him off. Mark has now calmed down considerably and is sitting in the back on the car with a furious look on his face. A nasty bruise is beginning to form of his cheek, but it looks like Mark has not even noticed it. Heading back to their apartment block, the car remains quiet until Mark breaks the silence.

'How could you not tell me? I am your best friend for god's sake! You lied to me and made me look like an idiot. There is was thinking that I had knocked you up and I would never have a chance with Lexie again. But it was her that was pregnant, how could you keep something like that from me.' Breaking off his rant, Callie speaks.

'This isn't about you, it never was. Lexie, the women that you supposedly love, had an unplanned pregnancy. She doesn't know who the father is or if she even wants a child. I had to protect her, give her time. With you breathing down her neck, she couldn't. It's her decision – not yours, especially since it may not even be yours. I'm sorry Mark, but that's the truth. This isn't about you. And after that childish rant, whatever good memories Lexie had of you probably went down the drain.' As Callie says in regards to Mark's childish actions, he sulks in the backseat of her car.

Once reaching the apartment, Mark gets out and turns to Callie. 'Back to mine, so we can sort out how to convince Lexie to talk to me.' And finally it all clicks, all the arguments that she has ever with Arizona and even Erica somehow involved Mark – both directly and indirectly. The memories of previous arguments come flooding back as she comprehends how unhealthy her relationship with Mark has become. To anyone on the outside, it's like Mark and her are in a relationship and Arizona is the third wheel, as if the blonde is just there to get her off. A sense of guiltiness settles over Callie as she realises what she destroyed. Arizona was the best part of her life and she inadvertently treated Arizona like crap and worshipped the ground Mark walked on. Her and Mark always make plans that didn't involve Arizona. Mark was her confidant when it should have been her girlfriend. And the cycle is continuing, she left Arizona in their apartment when she went and chased off after Mark. She put her relationship with Mark over her relationship with Arizona. Steeling herself what is undoubtable is going to develop into an argument; Callie finally answers his question about returning to his apartment.

'No'

'What, Torres?' Mark asks as a surprised voice. In moments of crisis, Callie has always had Mark's back and her answer shocked Mark.

'Since you found out that I was pregnant, you treated me like crap. You made demands and didn't even think about me. You acted if the world revolved around you and didn't care who's feeling you trampled to get your own way. Then when you found out Lexie was the one who was actually pregnant, you practically called Lexie a whore and said that Lexie can't make a decision about your kid until she talks to you. Avery punched you because all you care about is yourself and your own feelings. It's all about you. And you know what the worst thing is, thing has been going on for years. I let you walk all over me and my relationship with Arizona. And I want no further part of this. So I'm out. For years I've been telling people that deep down you were a good guy. But I was wrong, you are a jerk!'

As Callie shares her point of view with Mark, his face slowly gets redder and redder, 'So what, you are ditching me for Blondie? She left you Torres in case you haven't forgotten. She left you at an airport' Mark replies in an angry voice. 'I was there to pick up the pieces of your life, not her.'

'Mark, I made the biggest mistake of my life letting Arizona walk out of my life and then sleeping with you. For the rest of my life, I will apologise to Arizona for that. But, you I can't do that with you being the third wheel in my relationship. I had sex with you Mark, we can't be around each other as I try to fix my relationship.'

'Biggest mistake of your life? You didn't say that when you were moaning beneath me. I'm sure Arizona would love to hear all about it. Then we'll see if she is so forgiving when I tell her it was you that initiated the sorbet. You don't deserve that happiness.' Mark says with a smirk on his face as he still believes that Arizona won't take Callie back. 'You're damages goods Torres, you're crazy if you think that Blondie will take you back.'

Callie finally reaches a breaking point as Mark bad mouths the love of her life, and slaps Mark on the face. 'We are done. You and I, are over. I want nothing more to do with you as you don't deserve my friendship. You walk all over me, demanding my attention like a little puppy and you treat Arizona like crap. So stay the hell out of my life!' And with that, Callie storms off, leaving a shell-shocked Mark in her wake.

XXX

Travelling in the elevator up to her old apartment, Callie finally begins to calm down after her rant at Mark. She realises she has no idea what she is going to say to Arizona as she attempts to convince the blonde to give her a second chance. Reaching the apartment, she knocks on the door as she's unsure if she has permission to just walk in. Hearing so response, she slowly opens the door and sees Arizona in the same position as she left her over an hour ago. Callie can see that the Arizona has been crying, but at the moment, her face is strangely calm.

'I'm angry, like super angry that I was gone for 3 months and you were already sleeping with someone else. The fact that it was Mark Sloan makes me feel physically sick. And I know that I'm not innocent, but Calliope were you trying to hurt me as much as possible? And after all this, you go and chase after Mark again. Making sure he's ok, are you sure you aren't in a relationship with him? What the hell am I to you?' Arizona accuses.

Callie stands in the doorway, as she is unable to think up a suitable reply to this accusation and her internal monologue previously is confirmed; she made her girlfriend the third wheel in her own relationship

'I just don't understand what was going on in your head when you fell in bed with Mark Sloan? Of the 6 billion people in the world, that's the person you chose. And you don't seem to think that there is a problem' For the first time since she has started talking, Arizona looks up at Callie and waits for her to respond.

'I wanted to forget. I wanted to forget that I loved you and that I was alone. And Mark was there and he's safe. I don't love Mark and I don't want a relationship with him. So he was safe and he was there. I never thought I would see you again, and I know that's not an excuse, but I didn't do it to hurt you. I never say it until now, I always thought your jealously was unfounded when you would accuse me of spending too much time with him, or the inappropriate jokes he would make about our sex life. But I didn't see it, I didn't realise that I treated Mark better than you, and that you essentially became the third wheel. I am so sorry. Please Ari, forgive me, tell me that we can fix this and go back to how it was. '

'No we can't' And at Arizona's words, Callie feels her heart plummet and tears begin to fall down her face.

'Arizona, please, I want to be with you…' Arizona holds up her hand to stop Callie from talking.

'I don't trust you and you may not know it yet, but you don't trust me either. So we start again, go on dates and so one, do the firsts all over again. To get back to where we were will take time, but it will be worth it. Jumping back in won't solve anything. And can you please come and sit next to me and stop standing in the doorway.' She says as she gestures to the couch next to her.

As Callie takes in Arizona's words, she realises that she it right. They can't just go back to living together, they need to rebuild their shattered relationship from the ground up.

'And what about Mark?' Arizona asks, a look of dread on her face.

'I won't be seeing him at all.' For this first time since Arizona has been back, she smile. A genuine smile that lights up the room and Callie wonders how she ever let this women leave. With that answer, Arizona believes that they have a chance and the pain in her chest begins to lessen. Together, they will make it.

A/N 2: Technically this is the end of the story, I do have an idea to continue/sequel with them beginning to date again. Any thoughts would be appreciated. Thanks to all that read, reviewed and alert and so one. your support is appreciated.