Pete eventually opens up to Addison about his wife. Although his marriage stunk, he still loved her. Back at her grave, Pete yells at her for all the things she did that made him mad in life. It's a cathartic moment. Maybe he's not such a slippery ladies' man as we always thought.
Doug seems happy—in a weird way—to stay with Karen. He doesn't love her anymore, but he's at peace that he's staying with her by his own choice.
And Kathleen and Jeffrey? Pete's voodoo did the trick. They excitedly run into Oceanside to tell everyone that they've had sex. Now, if only Naomi can break that cake addiction...