Katie bemoans the lack of intimacy in her marriage, Jamie objects to Hugo's views on fidelity and Carolyn is frustrated by her inability to get pregnant.
Dave wonders aloud what Katie's getting out of therapy; Jamie finds it difficult to let go of her suspicions about Hugo; Carolyn's will to get pregnant wears down Palek's desire for intimacy; May contacts an old acquaintance.
Mason tries to distract Jamie from her obsession with Hugo; Dave and Katie awkwardly celebrate another anniversary; Palek and Carolyn's private frustration becomes public knowledge.
Dave surprises Katie by showing up at her therapy session; Palek is annoyed by a secret from Carolyn's past; Jamie pays her first visit to Dr. Foster after she fails to convince Hugo to take her back.
May makes a suggestion on how to help solve David and Katie's relationship problems. Meanwhile, Jamie vows to be celibate, but will Nick be too much of a temptation?
Another suggestion from Dr. Foster is met with skepticism by Dave and Katie. Also, Palek and Carolyn seek a fresh start after a recent, stressful decision. Nick invites a reluctant Jamie to a family affair.
With both kids out of the house for the night, Katie and David have a rare night alone and begin to work on their intimacy problems. Jamie's relationship with Nick hits a rough patch when Hugo returns. Meanwhile, Palek and Carolyn change homes, but their problems stay the same, even despite good news for Carolyn.
Palek is haunted by his fatherless childhood after hearing Carolyn's recent news; Jamie is surprised at how easily Nick is making himself at home in her apartment; Katie wonders aloud if more therapy is necessary.
The season finale finds Palek and Carolyn adjusting to his recent decision, Dave an Katie reevaluate their therapy meetings, while Hugo and Jamie meet by chance and Dr. Foster receives bad news.