Here is a dialog I've made about Sara's departure... Sorry it's a little bit long...

Hope you will enjoy and sorry for the grammar mistakes!
Greg went to the locker room and found Sara, sat in a corner, eyes down. He moved near her and knelt in front of her.
Greg: Sar’, you’re okay?
She looked at him and immediately wiped her tears away.
Sara: Yes… Of course, I’m okay… Don’t worry, I just have something in my eye and it hurt…but now, it’s okay…I’m fine…
She smiled at him but Greg can see it was a fake smile.
Sara: Excuse me, Greggo, I got to go…
Greg: Wait!
Greg stood up and blocked Sara’s way.
Sara: Greg, I have to go…
Greg: You’re lying… You’re not okay, you were crying…
Sara: Greg, I tell you I have something in my eye! Let me go, the others are waiting for me!
Sara tried to pass but Greg blocked her way again. She pushed him but he caught her arm and the sheets of paper she was holding, fell on the floor.
Sara: Damn Greg!
Greg: I’m sorry Sar’, I didn’t want to… Did I hurt you?
Sara: No, I’m fine… Don’t worry…
Greg knelt and took the sheets of paper. Sara knelt too. They were looking at each other when Greg said:
Greg: Sara, I’m really sorry… I didn’t mean to make you upset or hurt you… I’m just worried about you…
Sara: I know that, Greggo… Can you give me my sheets of paper?
Greg: Of course… I just want to be sure you’re okay…
Sara: I’m fine, Greg… I promise… My sheets of paper...
Greg: Yeah, of course... I’m sorry...
He was about to give them back when one of the sheets of paper caught his attention. His mouth went dry and the tears glistened in his eyes. He let fall the other sheets of paper and held the particular one between his shaking hands. Sara noticed it and put her hand on his knee.
Sara: Greg…
Greg: No, Sara! There’s no Greg! How can you do this? How can you do this to me?
Sara: Greg…
Greg: *tears down his cheeks* You promise me you were fine! I was worried about you and all you have done, is lying to me! You can’t leave me…us! Grissom needs you, I need you!
Sara: You’re going to be okay, Greg…
Greg: No, I’m not! How can you say things like that?! How can you be so blind, Sara?! I’ve loved you since the day you come in this lab and I always will!!! So, no, I’m not going to be okay!
Sara: *crying* Greg, wait!
It was too late. Greg was already gone.
*Later, at Greg’s apartment*
Greg was sitting in his sofa, tears running down his cheeks, when someone knocked at the door. He stood up and went to open.
Greg: Sara! What are you doing here?
Sara: Greggo, I’m sorry...
She moved near him and wiped slowly the tears that were running down Greg’s cheeks. Then, she hugged him and whispered in his ear.
Sara: I’m so sorry, Greg… I hate myself for making you cry… I’m sorry…
She stopped hugging him and looked at him. Greg could see the tears in her eyes and he caressed her cheek. Greg kissed her softly and Sara deepened the kiss. When they separate for air, Sara laid her head on Greg’s chest and whispered slowly:
Sara: I’m so sorry, Greg… I love you…
Greg: I love you, too Sar’…