"Of course I make the choice to bond with them. I find them extraordinary, they deserve a chance to see something more. It's not like they can go and do it themselves." The Doctor stated, not finally holding still as his expression remained stoic.
"No, I never said they were limited to their experiences. I go out and travel alone, I used to travel alone. It's still an adventure, and I can still help people alone. I don't need anyone there." The Doctor didn't even bother shaking his head as he spoke of these things, his eyes remaining fixed as he went into that darker part of his own feelings. "Wouldn't matter. Not like you lot believe what you see."
At the other's statement, the Doctor gave way with a slight smile. Was it because he was impressed? Or was it because he called him mad? He wasn't sure, but it was something to move his expression. "I am mad. That's me, a mad man with a box. I come, I go, and as a matter of fact, people do forget me. And like I said before, it's better that way. There are people who waste their entire lives waiting for me. No one should do that.
"No one can stay with me forever. It's too dangerous. They have other things to do. Or, it's just time. And don't give me that just make new friends jazz, because it doesn't work like that. Yes, I'll always meet new people, but I'll never meet those people again once they're gone." The Doctor held his gaze down at the other, standing straight and now no longer moving even in the slightest and the smile long faded.
"You live forever and watch everyone you've ever loved die. Either because of you, or because of natural causes. You let your heart break with each 'new' friend you make, each friend you get to watch grow old while you never change. And then you tell me that it's better to keep replacing them, and keep finding new ones, and keep breaking your hearts over and over again." He wasn't shouting, nor was his voice even raised. But the silent sorrow behind each word was hidden behind the anger that covered it.