Most of the tension noticably leaves him. Rose gets a human him, and Donna... well, he doesn't know the details, but she survives, that's the important thing. That means there's still hope, no matter how bad things might get. He doesn't want to delve any deeper.

He gives the TARDIS is a hug of gratitude, both mentally and physically. Even when he worries about his friends, or the lack of comfort from his other selves, she's always there for him to rely on.

"Then I'll be able to put these memories aside when we go back," he assures her. Besides, his mind could use a good spring cleaning.