The episode begins with Homer Simpson at work at the Springfield Nuclear Power Plant, where he is approached by his boss, Mr. Burns. Mr. Burns informs Homer that he has been selected to attend a corporate retreat. Homer is initially excited about the opportunity, but his enthusiasm quickly wanes when he learns that he will be attending the retreat with his former high school crush, a woman named Annika.

As Homer reminisces about his high school days, he recalls how he was infatuated with Annika, who was the most popular girl in school. He remembers the feelings of inadequacy he had back then, especially in comparison to her other admirers. This sets the stage for his internal conflict as he prepares to meet her again after many years.

At the retreat, Homer is nervous but hopeful about reconnecting with Annika. When he finally sees her, he is struck by how beautiful she still is. Annika, now a successful businesswoman, seems to have it all together, which makes Homer feel even more insecure about his own life. They engage in small talk, and Homer tries to impress her with stories of his life, but he struggles to maintain his confidence.

As the retreat progresses, Homer learns that Annika is not as perfect as she seems. She reveals that she has gone through a difficult divorce and is feeling lost in her life. This revelation creates a bond between them, as both characters share their struggles and insecurities. Homer begins to feel a sense of camaraderie with Annika, which reignites his old feelings for her.

Meanwhile, Marge, Homer's wife, becomes suspicious of his frequent mentions of Annika. She feels threatened by the rekindling of Homer's feelings for his high school crush. Marge confronts Homer about his emotional connection with Annika, leading to a tense discussion about trust and loyalty in their marriage. Homer reassures Marge of his love for her, but the tension remains.

As the retreat comes to a close, Homer faces a dilemma. He must decide whether to pursue a romantic connection with Annika or to reaffirm his commitment to Marge. In a moment of clarity, Homer realizes that while he has fond memories of Annika, his true happiness lies with Marge and their family. He chooses to leave the retreat early to return home to Marge.

In the final scenes, Homer arrives home and finds Marge waiting for him. He expresses his love and appreciation for her, emphasizing that she is the one he truly wants to be with. Marge, relieved and happy, forgives Homer for his momentary lapse in judgment. The episode concludes with the couple reaffirming their bond, showcasing the strength of their relationship despite the challenges they faced.

In the ending of "She Used to Be My Girl," Lisa Simpson confronts her feelings about her former friend, and Homer realizes the importance of family over past relationships. The episode concludes with a sense of resolution as Lisa finds closure, and Homer learns a valuable lesson about loyalty and love.

As the episode nears its conclusion, we find ourselves in a pivotal scene where Lisa is grappling with her emotions regarding her old friend, who has returned to Springfield. Lisa's internal conflict is palpable; she feels a mix of nostalgia and resentment as she reflects on their past friendship. The tension builds as she confronts her feelings, leading to a heartfelt moment where she acknowledges the changes in both herself and her friend.

Meanwhile, Homer is dealing with his own issues. He has been caught up in the excitement of rekindling a past romance with a high school sweetheart, which has caused friction with Marge. As the episode progresses, Homer begins to realize that his pursuit of a fleeting connection is overshadowing the love and commitment he has with his family. This realization hits him hard, and he understands that the bonds of family are far more significant than any past relationship.

In the final scenes, Lisa finds a sense of closure as she comes to terms with her past. She embraces her growth and the person she has become, letting go of the nostalgia that once held her back. Homer, on the other hand, makes a heartfelt decision to prioritize his family, reaffirming his love for Marge and the importance of their relationship.

The episode wraps up with a poignant moment that highlights the themes of growth, loyalty, and the significance of family ties. Lisa and Homer both emerge from their respective journeys with a deeper understanding of themselves and their relationships, setting the stage for future episodes where these lessons will resonate.

In the episode "She Used to Be My Girl" from Season 16 of The Simpsons, there is no post-credit scene. The episode concludes without any additional content after the credits roll. The focus remains on the main storyline, which revolves around Lisa's feelings of nostalgia and her interactions with her former friend, who has changed significantly over the years. The episode wraps up with the resolution of the plot without any further scenes or gags following the credits.

Lisa is prompted to reconnect with her old friend, a former classmate named Jennifer, after she sees a photo of her in a yearbook. This rekindling of their friendship leads Lisa to reflect on her own identity and the choices she has made, showcasing her desire for acceptance and connection.

Bart initially teases Lisa about her friendship with Jennifer, but as he observes the positive impact it has on her, he becomes more supportive. This change highlights Bart's underlying affection for Lisa and his desire to see her happy.

Homer plays a supportive yet comedic role in Lisa's journey. He encourages her to reach out to Jennifer, albeit in his typical bumbling manner, which adds humor to the situation while also showing his love for his daughter.

The reunion with Jennifer challenges Lisa's perception of herself as she realizes that her old friend has changed significantly, leading Lisa to confront her own insecurities and the pressures of growing up. This moment of self-reflection is pivotal for her character.

The flashbacks to Lisa and Jennifer's childhood serve to illustrate the deep bond they once shared and contrast it with their current lives. These moments evoke nostalgia and highlight the theme of change, emphasizing how friendships can evolve over time.

In "She Used to Be My Girl," there are a few elements that may be considered objectionable or upsetting for children or sensitive viewers:

1. Themes of Rejection and Heartbreak: The episode explores feelings of nostalgia and regret, particularly related to past relationships, which may be heavy for younger viewers to fully grasp.

2. Mature Relationships: The storyline involves adult themes surrounding romantic relationships and the complexities of past loves, which might not be suitable for all children.

3. Emotional Conflict: Characters experience emotional turmoil, including jealousy and insecurity, which could be distressing for sensitive viewers.

4. Social Commentary: The episode touches on issues of personal identity and societal expectations, which may provoke thought but could also be confusing for younger audiences.

While the show maintains its comedic tone, these themes may resonate differently with various viewers, particularly those who are more sensitive to emotional content.