Searching
He knew that there was something missing. He'd been looking, and searching, to no avail. All of those female companions, hell, even the male ones, meant next to nothing. However close he got to them, however much he loved them, they were never quite what he was looking for.
And then he visited New Earth again. Solved the problems of New New York with Martha's help. Helped Brannigan and his wife and tiny kitten children.
He met novice Hame again, watched his great friend, the face of Boe, die.
But those last words, 'You Are Not Alone', meant so much.