This missing scene begins after the end of season 5, episode 4 - "For Whom the Bell Tolls"...
"Stefan tried to kiss me," Elena said. She hadn't meant to blurt it out, but she said it without preamble, so that was the way it sounded.
She was sitting on a couch with Damon, leaning into him. Though it was after their service for Bonnie, she was still upset and Damon was still comforting her.
He hesitated before responding, and she almost looked up into his eyes to gauge his reaction, but he spoke before she did.
"Did you let him?"
She did look at his face now, it was totally blank.
"Let him kiss me?" She asked. "Of course not. That's when i told him that I'm with you. That's when he took off."
She watched him carefully before he responded, but his expression didn't change.
"Then why did you bring it up?" He asked. "Do you want me beat him up?"
"No!" She said quickly.
"Talk to him?" Damon asked. "Hate him?"
"No," Elena repeated. "I handled it."
"Then the point is..." He began, but let his words trail off.
"I thought you should know," she finally said.
"That the doppelgänger curse is intact, even when he has no memory of you from before? That he's still drawn to you?"
Elena cringed and broke eye contact. His expression wasn't changing, and she was getting nervous about what he was thinking.
"You need to know, Damon, that I'm not going to let anything or anyone get between us. Not even Stefan."
"Who you still love," he quickly added.
She looked back into his eyes. "Who we both love, who we both want to be OK."
"It's not the same," he said quietly, scowling a little.
"It is to me," she asserted. "I love him like a brother. I love you like..."
Words escaped her, so she just put her arms behind his head and pulled herself up to kiss him.
He relaxed into the kiss, and when she pulled away, his expression had softened.
"I know," he said softly.
She moved to sit by him, to lean into him again. "But Damon, I can't lose him. I can't lose anybody - Bonnie was too much. I can't lose Jeremy or Caroline," she looked into his eyes again, "or Stefan."
She watched him, but he looked like he was thinking, he said nothing until she added, "Damon?"
"I know," he said quickly, smiling briefly, "and I'll do everything I can to help you keep what you've got, and to get back..." He cut himself off. "I know, Elena. Whatever you need from me, you've got. You know that, right?"
She studied his face as she nodded. It wasn't blank, but she couldn't read his expression. It bothered her that she knew him well enough to know that he would do anything she asked of him, do anything he thought he needed to do for her - whether she would approve of his actions or not. He would give her whatever he thought she needed, but she couldn't read his expressions, she couldn't even give him the assurance she thought he needed.
"I know," she said, "but I'm not sure you know that you can trust me. I never know what you're thinking."
"Then listen to my words, Elena," he said pulling her in for a quick kiss. "I trust you to do anything you think you need to do, anything you want to do with him or anyone else. And when you're done, I trust that you'll come back to me."
He kissed her again, deeper this time. She joined in, feeling little better about his trust of her, and even more grateful that she could trust him.
Am I the only one that is a little surprised, though pleased, that Elena cut off the Stefan kiss (even if it was reluctantly)? As much as I am in love with her, I don't quite trust her...