[He wants to say that he never will, but that's out of his hands. He doesn't want to make promises to her that he can't keep.]

I-- [He takes a deep breath.] People come and go in everyone's lives. Their relationship might be damaged or it may be something out of both of their control. But the universe is full of more intelligent life than I can even fathom. There are always others. There are always possible friends, possible connections to make.

[There's something in his voice that suggests that this is what he's had to tell himself before. And that it might actually be someone else's advice told to him a long time ago.]