This missing scene begins after the end of season 5, episode 3 - Original Sin…
Elena was looking at Stefan, a Stefan who was sleeping again, but she was obsessing about something Damon had said earlier. He had mentioned that Ketzia had said their love was doomed, and when Elena said that the witch was crazy, Damon had said 'maybe not'.
"You are my life", Damon had told Elena after she had tried to reassure him about her love for him, and she believed him.
How could she not? He had shown it since she had started paying attention to him. It was clear to her while she was with Stefan, though the attention he had paid to her then was annoying. Really, she had always though he had paid attention to her to annoy his brother - and she still thought that it was true as far as when they first met. Damon barely, knew her, and she could tell he was mostly trying bug Stefan.
But then Elena had saved Damon in Georgia, and something had changed. Damon later helped her save Stefan from vampires trying to take revenge on him. He had saved her from humiliation when he had replaced Stefan in a dance, then had helped her fix his brother. Eventually, she had learned that, even when Damon was at his worst, he would not hurt her - she could ask him to do things for her and he would do them.
She had used his willingness to help her from time to time; and, whenever she thought about it, she was amazed that Damon was so willing to help her even though she was with Stefan.
She had let her guard down when he had nearly been killed by a werewolf bite - a bite she knew he had incurred while trying to save her friends and protect her. She had shown even more of her feelings when Damon helped her save Stefan. She had tried to deny the feelings she felt for Damon, though she knew that they were starting to show. She might have claimed that her feelings for Damon were changing as he helped her, but it didn't matter. Damon knew what she felt for him, and even Stefan knew - and finally called her on it.
But even then, she told herself, she was with Stefan. She had met Stefan first, no matter what she felt for Damon, she had never lost her feelings for Stefan.
Elena was starting to get a sick feeling as she thought about it. She had said so much in the past, had done so much. She hoped that Damon could see that things had changed, that she had changed.
But could he?
All he had ever said to her, all he had ever shown her, was that he loved her. Did her words and actions show that she loved him?
Surly, she thought, her actions since she had become a vampire showed that. Of course, while her humanity was off, she had said pretty mean things to him. She had used him every chance she got. Through it all, he had just loved her and tried to bring her back.
But after she had come back, she thought, surely he could tell. Of course, it was then that Silas had taken control of her; and she had again said some things that might make him doubt. She had said things and tried to kill him.
As he had done before, he just tried to save her, to bring her back. Again, he had let what she had said and done go without comment, without asking for an explanation or an apology.
And now she was dreaming of Stefan. He had said almost nothing about it; but had, again, gone with her to save his brother.
No wonder her words hadn't been all that reassuring to him. No wonder he still wondered if Ketzia might be right about Damon's love for Elena being doomed.
She trusted in his love for her, but she realized that she had good reason to trust it. However, he didn't have a reason to trust her love for him. How could he, given what she had done - both long ago and so recently? First there was Stefan, then the horrible things she had said and done to him after her transition.
She was still looking at Stefan, who was still sleeping; but she moved her eyes to Damon, who looked quickly away. She knew he had seen her staring at Stefan as she thought.
"I get it," she said quickly, not realizing that he might not understand.
Damon looked at her and scowled briefly, finally saying, "I'm glad."
She sighed when she realized that he had no idea what she meant. "I get why you said Ketzia might be right when she said our love is doomed to fail."
Damon's face lost the confused look and hescowled a little, but he didn't say anything.
He was sitting on a nearby couch, she had been on a chair near Stefan. She rose and walked to him. "I know what I've said and done Damon, what I've said in the past and what I've done ... well even today. I don't know why I've still got some kind of connection with Stefan, but it's not because I want to be with him." She glanced back at the sleep Stefan, then met Damon's eyes again. "I want him to be safe, I want him to be happy. But Damon, I want to be with you."
"I know." Damon said, nodding, though Elena thought it was one of those times that he was just saying what she wanted to hear. She thought she could see some doubt in his expression.
"That's it?" She asked, a little upset about not being convinced by his words. "You a have nothing else to say?"
"Well," he said after a hesitation, then looking away, "you might want to rethink your connection with Bonnie Bennett. You didn't see Ketzia, but I can tell from my time with her that witches are crazy. And vindictive."
She wondered if it was a joke, but couldn't spend any time thinking about it. She was too upset that her past actions were keeping him from seeing how committed she was to their relationship. She wanted to fix it, but wasn't sure how to do it. Finally, when his eyes met hers again, she just asked.
"Damon," she began, "I know you love me. I know that - you said that I am your life, and you have shown it since we met. And because of that, I know that you will always love me. I can trust in that. But you'll never trust me the same way, will you?"
"Not trust you?" She appreciated that his expression was incredulous as he spoke. "Elena, I've never trusted anyone more than you. I'll go anywhere you want me to go, do anything you want me to do. I trust you to do what you think is right, I trust you to protect your brother and mine. I trust you."
She cringed a little as she said, "You've always gone where I asked, done what I asked, Damon, whether I loved you or not. "
"Because I've always loved you," Damon told her, "I love you and I trust you, but you know that."
Elena nodded, sat next to him and hugged him. "I know, and I love you."
She knew what he was saying, and what he hadn't said. He loved her, and he didn't have to trust her to love him. He wanted her to know that he would love her whether she loved him or not. After all that had happened, he was telling her that she still had a choice of whether to love him or not. It wouldn't matter, he would love her like he always had.
She sat took his hand and snuggled up to him. She wanted him to trust in their relationship, in her feelings for him – though she knew she hadn't earned that trust yet.