In "Mom Stole My Boyfriend Cause I’m Prettier Than Her," the narrator feels betrayed when their mother begins dating their boyfriend, igniting feelings of jealousy and confusion. The story explores the dynamics of beauty and rivalry within the family, highlighting the narrator's struggle with their mother's actions and the emotional fallout of feeling overshadowed. As tensions rise, the narrator confronts their mother, leading to revelations about self-worth and the complexities of love. Ultimately, the tale delves into themes of identity, competition, and the importance of setting boundaries in relationships.