There's Always a Back Door is the sixth episode of Season 4 and the 42nd overall episode.
After sex with Boone at his house, Gretchen sees a text on Boone's phone from "Olivia" and assumes it's his wife. After contemplating that what she feels might be guilt over sleeping with a married man, Gretchen learns that Olivia is Boone's daughter and that he's divorced. Feeling that his best friend relationship with Jimmy isn't progressing the way it should, Edgar tries his best to bond with him. Jimmy is convinced that Gretchen having loud sex with Boone in the house was for him, and takes it as a sign that she still cares enough to be angry. After receiving a text from Lindsay stating that Gretchen is going to Boone's house to break up, Jimmy prepares a candlelight homecoming. But Gretchen and Boone work out their issues, leaving Jimmy alone and dejected. Meanwhile, Lindsay says she has no friends at work and deduces that she needs to act more like herself, which backfires.