How we cite our quotes:
And so he stopped looking at her eyes and started looking into them, returning their look before it was too late, before this connection between life and what came after was lost, and let her see all the vileness inside him, all the hatreds of two thousand solitary nights, while the two of them were still in touch with the void in which the sum of everything they'd ever said or done, every pain they'd inflicted, every joy they'd shared, would weigh less than the smallest feather on the wind.
"It's me," she said, "Just me."
"I know," he said, and kissed her. (4.1.99-101)
This is certainly the happiest of endings – and suggests that after everything that has happened between Patty and Walter, they did (and still do) love each other. Or, perhaps, considering Patty's doubts of whether she ever loved Walter, this suggests that we can come to love someone by sharing our life with them, sort of like the way we naturally love our family members (even if we might not like them very much).