Re: Dexter - Season 7 (with Spoilers)
He asked some couple on his table why they love each other and they explained to Dexter that it's because they share the same values and that they are heading in the same direction towards the same goals, and then he killed them. Later in the episode he talked to Rita about what she saw as her goals and how she saw the future and he agreed with her vision.
"Glitter is the herpes of arts and craft."
Troy Yingst. My Life as Liz