The Doctor knew he couldn't keep both of them on board any longer he would have to let one of go. This was the second fight that had broken out on the TARDIS between the two girls. They both hated each other and they both loved the Doctor he knew Rose would always be there for him she always had been ever since he had taken her from Gallifrey and the most he could ever ask of her she had already done, She did the one thing he probably never could have she forgave him. He would never forget what she did for him put it all behind her for his sake and when they first met Martha she had helped him get over the grieving part but so had Rose she was the only one who could speak or read gallifreyan and he was always happy when he could get her to speak their language. Rose was definitely one of a kind he would always remember her no matter what she even left behind her own TARDIS, Martha was a different story all together she was always there for him but he knew that he messed up her life to much and he also knew that a relationship could never develop between them and Martha just didn't know when to stop pushing for information on where he came from what happened why did he leave his home planet at least when rose did ask about his past on their planet she knew when to stop. Martha was also trying to push their relationship to make it go farther and rose wasn't liking that one bit even if rose didn't like him she still would never allow him to date Martha jones and she hated her, and he could never do that to Rose. Even though he would never admit it to her or himself he was very in love with Rose.
