Since the last chapter gave me more reviews and I counted them at 7; than ever before on this story I give you this chapter early. And here is the chapter that you have all been waiting for. Enjoy!

Meredith took one look at Derek, the expression on his face was clear as he stood and glared at his fiancée. Meredith nodded glad that the furious look was not directed at her as she turned to leave the porch and to give the couple some space.

"Where do you think you are going? Isabelle practically spat as Meredith walked past her.

"No Isabelle… leave Meredith out of this; she has nothing to do with this," Derek told her. "Meredith, go into the house please…" Derek said quietly as he turned and looked at Meredith and almost begged her to leave. The last thing he wanted was for her to witness what was going to happen next. Derek waited until he heard Meredith close the door behind her. "How dare you talk to her like that Isabelle?"

"Oh what a surprise… you defend her first?" Isabelle shouted at him, she was sick of hearing Derek defend Meredith.

"Do not bring Meredith into this…?" Derek warned her.

"Why not? She is the reason…"

"Meredith has nothing to do with this; this is between you and me Isabelle," Derek shouted as he took a step closer to her.

"You have no right talking to Meredith like that."

"It's always Meredith this, Meredith that. It like you are obsessed her with her Derek," Isabelle shouted back.

"Meredith is my friend Isabelle; I am not going to make any apologies for that," Derek replied lowering his voice. "As for telling her that her mother was alive, that is not your place."

"She deserves to know."

"You informing her about Ellis has nothing to do with what Meredith deserves. What has she ever done to you that would make you be so cruel?" Derek asked her, trying his best not to raise his voice again. The last thing he wanted was for everyone else in the house hearing their conversation.

"What has she done to me? She has taken you away from me…" Isabelle replied glaring at Derek.

"Jealous, are we?" Derek asked glaring back at her "You are jealous, because for once my life doesn't revolve around you and everything you want. It is not Meredith that has taken me away from you Isabelle, it was you… you just couldn't leave it alone could you? Meredith and the girls have gone through something we can't even imagine and all you are worried about is yourself." Derek paused for a second before continuing. "As for you there is no way you are pregnant Isabelle because we have never slept together, so if you were pregnant, it certainly is not mine. So I have to ask who have you been sleeping around with?" Derek asked seconds before Isabelle turned towards him slapped him across the face.

"How dare you talk to me…"

"Well after all the lies you have been telling Meredith, what am I supposed to believe Isabelle?" Derek asked.

"Ever since she arrived seven months ago, all I have heard is about Meredith and I am sick of it Derek. I am your fiancée, the woman you are supposed to marry not Meredith."

"Meredith has lost her parents Isabelle, how can you be so cold and unfeeling?"

"Cold…Derek of course I feel sorry for her but anyone would think that she was the only one that had ever lost someone; the way you go on about her. Derek I love you…but I will not be second place to anyone."

"Do not put all the blame on me…you haven't even tried to be nice towards Meredith since the first day you met her especially when she hasn't even done anything to you."

"She has taken you away from me." Isabelle repeated.

"You did that all by yourself…God I asked you to marry me Isabelle if that doesn't show you that I am committed to you; than I don't know what does."

"Yeah you did," Isabelle replied "but was that because you loved me or because you were running from something else?" she asked him.

She sighed when Derek didn't answer her. "Derek, I love you, and I can't bear the thought of losing you. But then I see you watching her and then the way you look at her Derek. From the very first day I met her, your eyes never leave her and you don't think I haven't noticed? I have tried to ignore it and I have kept telling myself that you love me."

"I do love you Is…" Derek said quietly. He did love her, just not in the way he should.

"But…" Isabelle asked as she continued to stand there waiting for a response and when she never received one she carried on. "I saw how you reacted to Simon. You are jealous…please just tell me one thing Derek, has anything happened between the two of you?"

"No…I would never cheat on you Isabelle," Derek said as he ran his fingers through his dark raven curls. He looked at his fiancée and noticed the difference in her. For the first time in months he could see that she had lost weight that she really couldn't afford to lose, suddenly making her look gaunt. "Isabelle, listen…" Derek said reaching out and taking her hand in his. "I am so sorry. I haven't helped matters I know. I wanted to help Meredith to adapt and get settled in especially when she was struggling."

"I know you wanted to be a friend to her Derek, but when did she become more important than me?"

"Isabelle, this takes a lot for me to admit this but I know I was in the wrong but please don't blame Meredith. None of this was her fault, she tried to push me away and I wouldn't let her. I had it in my head that I needed to help her, only I didn't realise what I was doing to both you and Meredith."

"Did you have feelings for her when you proposed to me?" Isabelle asked him and when Derek didn't answer her Isabelle withdraw her hand from his. "Then, why did you propose to me? Why when you have feelings for someone else?" She had known Derek for four years and whether he liked it or not she could read him like a book. Derek looked at her in surprise. "I have known you for a long time Derek, the way you look at Meredith… you have never looked at me like that," Isabelle said sadly.

"Honestly, I don't know. I thought it was just a harmless infatuation that I thought I would get over. I hadn't seen Meredith since she moved to England when she was four but when she arrived back here… I found myself falling in love with her," Derek told her, not wanting to hurt her but at the same time knew that he couldn't lie to her anymore.

"Where does that leave us, Derek? I do not want to be second best," Isabelle asked although deep down she already knew where this talk was heading.

"I think that it is obvious Isabelle, I love you, and please believe me when I say that, but I am not in love with you in the way that I should be, considering I am supposed to be marrying you," Derek said quietly, he knew that he couldn't marry her; it wasn't fair to her and he knew that in the long run he would hurt her more if he did go ahead with the wedding.

"Then why propose to me when you knew you had feelings for her?" Isabelle asked him, wanting to know the reason for his actions.

"I don't want to hurt you Isabelle," Derek told her.

"Well it is a bit late for that Derek," Isabelle bit back. "Please for once be honest and don't lie to me?"

"I didn't want to throw away what we had Isabelle. I thought it was the right thing to do. You don't just throw away two years over someone I have just met and barely know and as I said I thought that it was an infatuation that would pass. I am so sorry Isabelle."

"Me too Derek."

"Are you pregnant Isabelle?" Derek asked her.

"Of course not Derek, I only said it because I wanted Meredith to back off. I'm sorry, I should apologise to her."

"No, leave it to me Isabelle. It wasn't Meredith that was doing the chasing, it was me. I think you have said enough to her, don't you?" Derek said to her and Isabelle had the decency to look ashamed.

"I guess I should give this back to you," Isabelle said as she handed Derek back her engagement ring back.

"Thank you."

"Goodbye Derek" Isabelle said quietly as she started to walk out of the porch and into the house.

"Goodbye Isabelle," Derek said with a sad smile which Isabelle returned.

Derek watched her walk away. He would miss the Isabelle that he had first known and fell in love with but not the Isabelle of the last few months. He took a deep breath before leaving the porch and entering the house to face the music. There was damage control to be done and he hoped that the one person he had hurt the most would forgive him.

A/N Bye, bye Isabelle

I did consider making Isabelle into a right bitch in this chapter to bring her back later to add more drama but seeing that I want to get this story finished as quickly as I can I won't be bring her back.

In the original idea for this story Isabelle was going to blackmail Meredith who was pregnant with Derek's baby; to end their affair so that Derek would marry her. Aren't you glad I changed my mind because I think I would have gotten lynched by all you wonderful people…Lol.

Please Read and Review :)