The next morning, Dexter is deleting files from his laptop. Deb reminds him of all the things he needs to do in preparation for the funeral, and he thinks about all the other things he needs to do, like gas up his boat. He asks Deb to be the person in Harrison's life who is always there for him ("something decent in his life") since his mother is now gone. "Love him as if he were your own," he tells her. "He is my own" is her response. She reminds him how important he is to his son, and tells him he is decent and good too.
At the station, LaGuerta reminds Quinn that the case is not theirs, but he has something to tell her anyway. He says he went to clean up at Dexter's house and talked to Elliot. He explains the kiss and punch to her. "Why are you telling me this? What are you implying?" she asks. He reminds her "when the wife is dead, 90% of the time the husband did it." She receives a call and asks him to leave her office. LaGuerta then calls Deb to tell her that Dexter didn't show up to his interview with the FBI. She goes back to the apartment to find the woman who lives downstairs feeding Harrison, not Dexter. She tries calling him, but gets his voicemail.
Dexter stands over Rita in her casket, and tells her he won't be at the funeral because he doesn't deserve to be. "I hope you don't mind I chose that dress you were wearing when we first met," he tells her. "I was never really honest with you. I'm a serial killer; that's what I am. I led you to believe I'm a human being, but I'm not. That's a lie." He touches her hands briefly and leaves.
He goes to his storage unit, grabs some clothes, his tools and his blood slides. He sets everything else ablaze and leaves, while wondering where Harry is. He gets on his boat (the appropriately titled Slice of Life) and heads out of Miami. 'I've disappeared so many people. My turn now, to disappear myself.'
Deb is at the funeral getting everything set up. The FBI watches from the distance, as they still haven't heard from Dexter. She calls him, but he ignores it as he continues out of Miami. Then, looking at his phone, he has another flashback. This time, he's on his boat disposing of a body he'd wrapped in his plastic bags. Rita calls him to check in and see if he's feeling better. She tells him that she wasn't completely honest with him; she has two kids. He tells her that he likes kids and that he knew already because Deb had told him about that, as well as the problems she had going on with her ex-husband. "So you know all about me," she says. "I'd like to know more...so maybe we should get together again sometime." She says she'd like that "a lot a lot" and she tells him that he makes her feel good. He says she makes him feel that way too. Then say goodbye. Back to the present, Dexter has his eyes closed and says "goodbye. I'm sorry." Then, his boat begins to sputter and he realizes that he needs to get gas. He pulls over to gas up, and walks into a little store, where a man is angrily ringing the bell on the counter, needing the key to the bathroom. He calls Dexter a "retard" and tells him to leave, but instead Dex follows him into the bathroom. The two exchange some unpleasant words and Dexter explains to him that he had a tough week before picking up a sharp instrument and using it to bludgeon the man's head. Dexter gets up and looks at himself in a dirty mirror, where he sees Harry standing behind him. "That's the first human thing I've seen you do since she died, Dexter," Harry tells him. "It's okay son, to show what you're feeling." Dexter gets down on the ground, where he lets out multiple screams of anguish. "You need to go back," Harry instructs him. Dexter falls over on his side and thinks about it.
The episode concludes with his eulogy: "She had a big heart. Big enough for both of us. Had to be. I wasn't even human. When we first met, I never expected that to change. She reached out and found something I didn't even know was there. She never hurt anybody. She was innocent and she died a brutal death and I can't...fix it...but I know I have to try here in Miami with the people who knew her, who cared about her, who loved her."
'Like I did,' he says to himself.
You wrote "Rita" when you mean Deb and you wrote "wedding" when you meant funeral…dude, get a copy editor.