The Heart Wants What It Wants

Summary: Mark and Bella were high school sweethearts. She was his everything. She was his sun, his moon, his WORLD. So, when Bella broke it off with Mark to go overseas to England to study Medicine, Mark knows in his heart that no other woman will ever complete him like she did. So, what can Mark do when Bella shows up twenty-odd years later, still superhot and proving that he never did get over her?

Disclaimer: I don't own Grey's Anatomy. I do own Bella though. Obviously, Mark/OC! ENJOY!

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Prologue

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She never meant to end things the way she did.

But, as she gripped onto her acceptance letter to the University of Cambridge in Cambridge, England, she knew she had made the right decision for her future. Bella was obsessed with becoming the best doctor that she could be, but more than that, she longed to explore the world. There was just one thing Bella may just love more than either of those things and that was Mark and sadly, she was going to need to break it off with him.

Bella knew that Mark had been a player before they had gotten together in tenth grade, and she knew that they both loved each other so much that Mark would never cheat on her, but if she was in England and he was in the United States? Bella knew that he would try, but he was Mark Sloan, and sex was something he needed.

But, it would not lesson the blow. Bella could already feel the tears flooding her eyes as she thought about not being with Mark. They had been together for so long; they were almost a married couple now. They had been together for six years now and Bella had overheard Mark talking to Derek about purposing to her. This breakup would destroy them both.

She, however, knew she had to step up and be the bigger person; it was not right to ask Mark to wait for her. They had four years of Med-school and Bella was already looking into getting a residency in England so there was another few years, depending on what field she wanted to go into. She didn't want to be the one to ask Mark to wait nor did she want him to feel like he had to.

With a firm grasp on her heart, Bella went to the dorm room suite that she, Mark and Derek shared. It was a two-bedroom apartment styled place, queen size beds in both bedrooms and their own private bathroom. She and Mark shared one bedroom and Derek had the other. They shared a living room and kitchen.

When she arrived to their dorm, she found Mark and Derek going over some notes for their exams. Mark and Derek would be staying in New York and had no idea Bella's dreams for England. She hated thinking about breaking Mark's heart, especially when she saw such a bright future with him, but she knew it was just a child's dream. Their futures were going in opposite directions.

"Hey Bells!" Mark got up from their tiny couch to greet her with a kiss. Bella knew it was going to be their last one, so she enjoyed it before she pulled back. "Bells?"

"Can we talk? Privately?" Bella asked, already feeling her heart snap in two but she hid it well enough. Mark and Derek shared a look before the couple went to their room.

"What's up?" Mark asked, sitting down on their bed.

Bella knew that she had to be straightforward, that she couldn't beat around the bush about this, but she didn't want to make Mark feel pain. She loved him! However, she pulled herself together just long enough to say, "I'm going to England." Mark was stunned by her words and stared at her. "I- I got accepted to Cambridge in England and I… I plan to go. I know you and Derek are already accepted here for Med school but I… I wanted to tell you."

Mark was at lost for words. "What… what does this mean for… us?"

"I love you Mark, you know that I do, but… I don't want to hold you back. So, I guess this is it." Bella readied herself for the back lash.

"This doesn't have to be it, Bella!" Mark jumped to his feet. "Why can't we do the long distant thing?"

"That isn't the sort of relationship I ever want to have, and neither do you." Bella stated firmly, already feeling the tears forming in her eyes. "I'm really sorry Mark but it won't work out. Please, just trust me, okay?"

"I love you, Goddammit! I love you so damn much, Isabella Washington!" Mark was getting really upset and she took it, because she knew that she deserved it. "Everyone keeps telling us that we're it, that we'll make it in the long run. Why can't you understand that? Why can't you believe that we won't make it?"

By this point, Bella could feel the tears threatening to spill down her pale cheeks. "Stacy says I can stay with her during exam week. Goodbye Mark…"

"No!" He pulled her into his arms and he kissed her passionately. Bella knew she should say no, to stop this, but she couldn't and she found herself kissing him back. It was how she found herself in bed with Mark.

Mark desperately trying to make her stay by proving that they were going to make it in the long run; Bella was just making the most of her last moments with the love of her life. After their love making, Mark fell asleep, and Bella packed up her stuff, wrote him a note and then left the apartment. Derek was already in bed and so Bella didn't have to say goodbye to him.

She couldn't let her emotions get in the way of her becoming what she wanted more than anything in the world. She had never wanted a relationship in the first place, and it wouldn't be the thing that stopped her now anyway.

Bella left their dorm and never looked back… because if she did, she knew she would have stayed.

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Up Next: Reunited: Bella finds her way back to Mark after so long; she's gone all over the world but her heart has only wanted one thing for years and that's Mark. But, has he moved on to Addison? Is Bella too late?

I hope you like Bella. I really liked writing about her and I got lost in this chapter. :) I hope you continue to enjoy reading about Bella and Mark (I'm thinking Mella for their ship name? What do you think?).

Let me know your thoughts down below!

Xoxo,

Nerdy~