Sleeping with Other People

Lainey's pattern of cheating stems from unresolved emotional issues stemming from her college experience with Matt. She never processed her feelings about that relationship, which manifested as an inability to commit to Sam despite wanting to. The film frames this as a manifestation of her 'love addiction' - she seeks validation through sexual encounters rather than forming genuine emotional connections.

In college, Lainey's mission to lose her virginity to Matt already showed she equated sex with self-worth.

They reconnect at a meeting for love addicts. Lainey attends seeking help with her commitment issues, and Jake is there after being dumped by his girlfriend Hannah due to his infidelities. This ironic coincidence - both serial cheaters at the same support group - sets up their renewed connection.

Their college meeting established they shared similar patterns of seeking validation through sex.

The 'mousetrap' is a code-word Lainey and Jake establish during their double date to acknowledge when the tension between them becomes too strong to ignore. It serves as a boundary mechanism - when one of them says it, they're acknowledging the romantic pull but choosing to remain friends instead of acting on it.

Jake calls out Lainey's name during intimacy with Paula because he realizes his feelings for Lainey are genuine and deeper than physical attraction. This moment signals to both Jake and Lainey that they cannot escape their emotional connection, regardless of who they're with.

Throughout the film, Jake consistently prioritizes Lainey's well-being over other relationships.

Jake punches Matt two months after Lainey moves to Michigan because he finally confronts the source of Lainey's emotional pain. Seeing Matt at brunch triggers Jake's protective instincts and his frustration over how Matt hurt Lainey in college. The punch leads to Jake's arrest and breakup with Paula.

Jake had been helping Lainey process her feelings about Matt throughout their friendship, building toward this explosive moment.

Lainey confronts Matt using their shared history from college - specifically, the secret of their past sexual relationship and presumably whatever happened during her mission to lose her virginity to him. She threatens to expose details that would be damaging to Matt's reputation and marriage, forcing him to accept the settlement.

Lainey had confided to Jake about her unresolved feelings for Matt, hinting their history was more complicated than just a student-teacher dynamic.

Lainey dates Chris as a way to resist acting on her feelings for Jake. She believes she's not ready for a healthy relationship and tries to move on by dating someone safe. This decision confuses Jake and highlights Lainey's self-sabotaging patterns - choosing emotional distance over confronting her real feelings.

The 'mousetrap' system was established precisely because Lainey feared acting on her attraction to Jake.

Jake cannot commit to Paula because his pattern of infidelity stems from deeper emotional issues he hasn't addressed. Even when he genuinely wants to be with Paula, his inability to be emotionally available and his unresolved feelings for Lainey prevent genuine connection. His calling out Lainey's name during intimacy with Paula proves his heart isn't in it.

Jake's appearance at the love addicts meeting established he has commitment issues separate from any specific partner.

After Jake's arrest for punching Matt, he calls Lainey from the police station and confesses his love for her. This vulnerable moment breaks through their platonic barrier. The arrest also ends his relationship with Paula and leads to Matt suing him for emotional distress.

Jake had been wrestling with his feelings for Lainey throughout the film, and the arrest forces him to be honest.

Jake is drawn to Paula because she represents a chance at a different kind of relationship - one with real stakes and maturity. As a divorced mother, Paula requires more than just physical attraction, which challenges Jake's usual patterns. However, his inability to fully commit shows he's not truly ready to change despite his intentions.

Jake helps Lainey by acting as an outside perspective on her patterns. He guides her to realize that her quest for validation through sex - starting with Matt in college - has prevented her from forming genuine emotional connections. He also teaches her the importance of self-exploration when she reveals she hasn't had an orgasm in over a year.

Jake's observation about Matt being 'the dullest person he's ever met' in college foreshadows his role as someone who sees through Lainey's choices.

Lainey decides to re-enroll in medical school in Michigan because it's a goal she abandoned after her college experience with Matt. Returning to this dream represents her trying to reclaim her independence and identity outside of romantic relationships. The move also forces Jake to confront whether he'll let her go or fight for their relationship.

The timeline mentions Lainey's ambitions during college, showing this was a long-held dream she put on hold.

During their night of realizations, Lainey and Jake acknowledge they love each other but recognize neither is ready for a healthy relationship yet. Lainey is still haunted by her past with Matt, while Jake hasn't fully addressed his infidelity patterns. This honest confrontation is necessary before they can actually be together.

Their use of the 'mousetrap' code-word throughout the film built toward this acknowledgment.