Rose pulled away from the kiss as she heard the tardis take flight again. "Wait, Doctor!" Rose couldn't help but scream and run towards the fleeting police box. It was a fruitless attempt and she knew it, but she didn't want to accept the fact that he would leave her so abruptly.
The man walked towards her and put a comforting hand on her shoulder. "I understand, Rose," he said, and she flinched away from his touch.
"Look, I get that you look like him, you've got his memories, but you're human. But please, I really don't think that you understand, so please don't." Rose stood up, wiping the tears from her eyes. He tried to grab her hand as she walked away, but she pulled away.
"I feel what he felt for you, Rose. All I ask is for you to understand that I love you," he finished and stopped walking after her.
Rose turned around and looked into the man's eyes. She saw everything that she ever saw in the Doctor's eyes. The love, the friendship, the first time he whispered "run" and grabbed her hand.
"I understand that it's different, Rose. I just want to be with you," he pleaded, bringing an air of humanity that Rose had only heard a few times from the Doctor. "I can grow old with you, settle down with you, have a life with you. If you can't deal with me, Rose, please tell me. I'll under-"
"Stop saying you understand!" Rose shouted. "You may have all of his memories and you're basically the human version of him, but you're not him!" She ran towards him and fell into him. She sobbed as he wrapped his arms around her, similar to the way the Doctor had on several occasions. "He just left me...again," Rose stuttered in between her gasps for oxygen.
"He had to, Rose," he said in a quiet, soothing voice while stroking her hair softly. "The walls were closing. You and I are still in a parallel universe, not in his or theirs. I'm going to do my best to help you through this, but I need to know that you're okay with this."
Rose pulled away slightly and looked at the man before her. Slim, a little bit foxy...she liked it. Rose pulled him down slightly by his collar, bringing his lips to hers. He slowed down and pulled away hesitantly. "Can I take that as a yes?"